diff --git a/.presentx/static/article.css b/.presentx/static/article.css
new file mode 100644
index 0000000..382c1cd
--- /dev/null
+++ b/.presentx/static/article.css
@@ -0,0 +1,180 @@
+body {
+  margin: 0;
+  font-family: Helvetica, Arial, sans-serif;
+  font-size: 16px;
+}
+pre,
+code {
+  font-family: Menlo, monospace;
+  font-size: 14px;
+}
+pre {
+  line-height: 18px;
+  margin: 0;
+  padding: 0;
+}
+a {
+  color: #375eab;
+  text-decoration: none;
+}
+a:hover {
+  text-decoration: underline;
+}
+p,
+ul,
+ol {
+  margin: 20px;
+}
+
+h1,
+h2,
+h3,
+h4 {
+  margin: 20px 0;
+  padding: 0;
+  color: #375eab;
+  font-weight: bold;
+}
+h1 {
+  font-size: 18px;
+  padding: 2px 5px;
+}
+h2 {
+  font-size: 16px;
+}
+h3 {
+  font-size: 16px;
+}
+h3,
+h4 {
+  margin: 20px 5px;
+}
+h4 {
+  font-size: 16px;
+}
+
+div#heading {
+  margin: 0 0 10px 0;
+  padding: 21px 0;
+  font-size: 20px;
+  font-weight: bold;
+}
+
+div#heading .author {
+  padding-top: 10px;
+  font-size: 14px;
+  font-weight: normal;
+}
+
+div#topbar {
+}
+
+body {
+  text-align: center;
+}
+div#page {
+  width: 100%;
+}
+div#page > .container,
+div#topbar > .container {
+  text-align: left;
+  margin-left: auto;
+  margin-right: auto;
+  padding: 0 20px;
+  width: 900px;
+}
+div#page.wide > .container,
+div#topbar.wide > .container {
+  width: auto;
+}
+
+div#footer {
+  text-align: center;
+  color: #666;
+  font-size: 14px;
+  margin: 40px 0;
+}
+
+.author p {
+  margin: 0;
+  padding: 0 20px;
+}
+
+/* legacy - taken over by prism.js */
+/* div.code,
+div.output {
+  margin: 20px 20px 20px 40px;
+  -webkit-border-radius: 5px;
+  -moz-border-radius: 5px;
+  border-radius: 5px;
+} */
+
+div.output {
+  padding: 10px;
+}
+
+/* div.code {
+  background: white;
+} */
+div.output {
+  background: black;
+}
+div.output .stdout {
+  color: #e6e6e6;
+}
+div.output .stderr {
+  color: rgb(244, 74, 63);
+}
+div.output .system {
+  color: rgb(255, 209, 77);
+}
+
+.buttons {
+  margin-left: 20px;
+}
+div.output .buttons {
+  margin-left: 0;
+  margin-bottom: 10px;
+}
+
+#toc {
+  float: right;
+  margin: 0px 10px;
+  padding: 10px;
+  border: 1px solid #e5ecf9;
+  background-color: #eee;
+  box-shadow: 3px 3px 2px #888888;
+
+  max-width: 33%;
+
+  -webkit-border-radius: 5px;
+  -moz-border-radius: 5px;
+  border-radius: 5px;
+}
+
+#tochead {
+  font-weight: bold;
+  font-variant: small-caps;
+  font-size: 100%;
+  text-align: center;
+  padding-bottom: 5px;
+}
+
+#toc ul,
+#toc a {
+  list-style-type: none;
+  padding-left: 0px;
+  color: black;
+  margin: 0px;
+}
+
+ul.toc-inner a {
+  padding-left: 10px !important;
+}
+
+@media print {
+  .no-print,
+  .no-print * {
+    display: none !important;
+  }
+}
diff --git a/.presentx/static/dir.css b/.presentx/static/dir.css
new file mode 100644
index 0000000..5bd039e
--- /dev/null
+++ b/.presentx/static/dir.css
@@ -0,0 +1,187 @@
+/* copied from $GOROOT/doc/style.css */
+
+body {
+  margin: 0;
+  font-family: Helvetica, Arial, sans-serif;
+  font-size: 16px;
+}
+/*  legacy-taken over by prism.js
+pre,
+code {
+  font-family: Menlo, monospace;
+  font-size: 14px;
+} */
+/* pre {
+  line-height: 18px;
+} */
+pre .comment {
+  color: #375eab;
+}
+pre .highlight,
+pre .highlight-comment,
+pre .selection-highlight,
+pre .selection-highlight-comment {
+  background: #ffff00;
+}
+pre .selection,
+pre .selection-comment {
+  background: #ff9632;
+}
+pre .ln {
+  color: #999;
+}
+body {
+  color: #222;
+}
+a,
+.exampleHeading .text {
+  color: #375eab;
+  text-decoration: none;
+}
+a:hover,
+.exampleHeading .text:hover {
+  text-decoration: underline;
+}
+p,
+pre,
+ul,
+ol {
+  margin: 20px;
+}
+pre {
+  background: #e9e9e9;
+  padding: 10px;
+
+  -webkit-border-radius: 5px;
+  -moz-border-radius: 5px;
+  border-radius: 5px;
+}
+
+h1,
+h2,
+h3,
+h4,
+.rootHeading {
+  margin: 20px 0;
+  padding: 0;
+  color: #375eab;
+  font-weight: bold;
+}
+h1 {
+  font-size: 24px;
+}
+h2 {
+  font-size: 20px;
+  background: #e0ebf5;
+  padding: 2px 5px;
+}
+h3 {
+  font-size: 20px;
+}
+h3,
+h4 {
+  margin: 20px 5px;
+}
+h4 {
+  font-size: 16px;
+}
+
+dl {
+  margin: 20px;
+}
+dd {
+  margin: 2px 20px;
+}
+dl,
+dd {
+  font-size: 14px;
+}
+div#nav table td {
+  vertical-align: top;
+}
+
+div#heading {
+  float: left;
+  margin: 0 0 10px 0;
+  padding: 21px 0;
+  font-size: 20px;
+  font-weight: normal;
+}
+div#heading a {
+  color: #222;
+  text-decoration: none;
+}
+
+div#topbar {
+  background: #e0ebf5;
+  height: 64px;
+}
+
+body {
+  text-align: center;
+}
+div#page,
+div#topbar > .container {
+  clear: both;
+  text-align: left;
+  margin-left: auto;
+  margin-right: auto;
+  padding: 0 20px;
+  width: 900px;
+}
+div#page.wide,
+div#topbar > .wide {
+  width: auto;
+}
+div#plusone {
+  float: right;
+}
+
+div#footer {
+  color: #666;
+  font-size: 14px;
+  margin: 40px 0;
+}
+
+div#menu > a,
+div#menu > input {
+  padding: 10px;
+
+  text-decoration: none;
+  font-size: 16px;
+
+  -webkit-border-radius: 5px;
+  -moz-border-radius: 5px;
+  border-radius: 5px;
+}
+div#menu > a,
+div#menu > input {
+  border: 1px solid #375eab;
+}
+div#menu > a {
+  color: white;
+  background: #375eab;
+}
+
+div#menu {
+  float: right;
+  min-width: 590px;
+  padding: 10px 0;
+  text-align: right;
+}
+div#menu > a {
+  margin-right: 5px;
+  margin-bottom: 10px;
+
+  padding: 10px;
+}
+div#menu > input {
+  position: relative;
+  top: 1px;
+  width: 60px;
+  background: white;
+  color: #222;
+}
+div#menu > input.inactive {
+  color: #999;
+}
diff --git a/.presentx/static/dir.js b/.presentx/static/dir.js
new file mode 100644
index 0000000..00ad22c
--- /dev/null
+++ b/.presentx/static/dir.js
@@ -0,0 +1,41 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// copied from $GOROOT/doc/godocs.js
+
+function bindEvent(el, e, fn) {
+  if (el.addEventListener) {
+    el.addEventListener(e, fn, false);
+  } else if (el.attachEvent) {
+    el.attachEvent('on' + e, fn);
+  }
+}
+
+function godocs_bindSearchEvents() {
+  var search = document.getElementById('search');
+  if (!search) {
+    // no search box (index disabled)
+    return;
+  }
+  function clearInactive() {
+    if (search.className == 'inactive') {
+      search.value = '';
+      search.className = '';
+    }
+  }
+  function restoreInactive() {
+    if (search.value !== '') {
+      return;
+    }
+    if (search.type != 'search') {
+      search.value = search.getAttribute('placeholder');
+    }
+    search.className = 'inactive';
+  }
+  restoreInactive();
+  bindEvent(search, 'focus', clearInactive);
+  bindEvent(search, 'blur', restoreInactive);
+}
+
+bindEvent(window, 'load', godocs_bindSearchEvents);
diff --git a/.presentx/static/favicon.ico b/.presentx/static/favicon.ico
new file mode 100644
index 0000000..48854ff
Binary files /dev/null and b/.presentx/static/favicon.ico differ
diff --git a/.presentx/static/jquery-ui.js b/.presentx/static/jquery-ui.js
new file mode 100644
index 0000000..f391938
--- /dev/null
+++ b/.presentx/static/jquery-ui.js
@@ -0,0 +1,6 @@
+/*! jQuery UI - v1.10.2 - 2013-03-20
+* http://jqueryui.com
+* Includes: jquery.ui.core.js, jquery.ui.widget.js, jquery.ui.mouse.js, jquery.ui.resizable.js
+* Copyright 2013 jQuery Foundation and other contributors Licensed MIT */
+
+(function(e,t){function i(t,i){var a,n,r,o=t.nodeName.toLowerCase();return"area"===o?(a=t.parentNode,n=a.name,t.href&&n&&"map"===a.nodeName.toLowerCase()?(r=e("img[usemap=#"+n+"]")[0],!!r&&s(r)):!1):(/input|select|textarea|button|object/.test(o)?!t.disabled:"a"===o?t.href||i:i)&&s(t)}function s(t){return e.expr.filters.visible(t)&&!e(t).parents().addBack().filter(function(){return"hidden"===e.css(this,"visibility")}).length}var a=0,n=/^ui-id-\d+$/;e.ui=e.ui||{},e.extend(e.ui,{version:"1.10.2",keyCode:{BACKSPACE:8,COMMA:188,DELETE:46,DOWN:40,END:35,ENTER:13,ESCAPE:27,HOME:36,LEFT:37,NUMPAD_ADD:107,NUMPAD_DECIMAL:110,NUMPAD_DIVIDE:111,NUMPAD_ENTER:108,NUMPAD_MULTIPLY:106,NUMPAD_SUBTRACT:109,PAGE_DOWN:34,PAGE_UP:33,PERIOD:190,RIGHT:39,SPACE:32,TAB:9,UP:38}}),e.fn.extend({focus:function(t){return function(i,s){return"number"==typeof i?this.each(function(){var t=this;setTimeout(function(){e(t).focus(),s&&s.call(t)},i)}):t.apply(this,arguments)}}(e.fn.focus),scrollParent:function(){var 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t._mouseDown(e)}).bind("click."+this.widgetName,function(i){return!0===e.data(i.target,t.widgetName+".preventClickEvent")?(e.removeData(i.target,t.widgetName+".preventClickEvent"),i.stopImmediatePropagation(),!1):undefined}),this.started=!1},_mouseDestroy:function(){this.element.unbind("."+this.widgetName),this._mouseMoveDelegate&&e(document).unbind("mousemove."+this.widgetName,this._mouseMoveDelegate).unbind("mouseup."+this.widgetName,this._mouseUpDelegate)},_mouseDown:function(i){if(!t){this._mouseStarted&&this._mouseUp(i),this._mouseDownEvent=i;var s=this,n=1===i.which,a="string"==typeof this.options.cancel&&i.target.nodeName?e(i.target).closest(this.options.cancel).length:!1;return n&&!a&&this._mouseCapture(i)?(this.mouseDelayMet=!this.options.delay,this.mouseDelayMet||(this._mouseDelayTimer=setTimeout(function(){s.mouseDelayMet=!0},this.options.delay)),this._mouseDistanceMet(i)&&this._mouseDelayMet(i)&&(this._mouseStarted=this._mouseStart(i)!==!1,!this._mouseStarted)?(i.preventDefault(),!0):(!0===e.data(i.target,this.widgetName+".preventClickEvent")&&e.removeData(i.target,this.widgetName+".preventClickEvent"),this._mouseMoveDelegate=function(e){return s._mouseMove(e)},this._mouseUpDelegate=function(e){return s._mouseUp(e)},e(document).bind("mousemove."+this.widgetName,this._mouseMoveDelegate).bind("mouseup."+this.widgetName,this._mouseUpDelegate),i.preventDefault(),t=!0,!0)):!0}},_mouseMove:function(t){return e.ui.ie&&(!document.documentMode||9>document.documentMode)&&!t.button?this._mouseUp(t):this._mouseStarted?(this._mouseDrag(t),t.preventDefault()):(this._mouseDistanceMet(t)&&this._mouseDelayMet(t)&&(this._mouseStarted=this._mouseStart(this._mouseDownEvent,t)!==!1,this._mouseStarted?this._mouseDrag(t):this._mouseUp(t)),!this._mouseStarted)},_mouseUp:function(t){return e(document).unbind("mousemove."+this.widgetName,this._mouseMoveDelegate).unbind("mouseup."+this.widgetName,this._mouseUpDelegate),this._mouseStarted&&(this._mouseStarted=!1,t.target===this._mouseDownEvent.target&&e.data(t.target,this.widgetName+".preventClickEvent",!0),this._mouseStop(t)),!1},_mouseDistanceMet:function(e){return Math.max(Math.abs(this._mouseDownEvent.pageX-e.pageX),Math.abs(this._mouseDownEvent.pageY-e.pageY))>=this.options.distance},_mouseDelayMet:function(){return this.mouseDelayMet},_mouseStart:function(){},_mouseDrag:function(){},_mouseStop:function(){},_mouseCapture:function(){return!0}})})(jQuery);(function(e){function t(e){return parseInt(e,10)||0}function i(e){return!isNaN(parseInt(e,10))}e.widget("ui.resizable",e.ui.mouse,{version:"1.10.2",widgetEventPrefix:"resize",options:{alsoResize:!1,animate:!1,animateDuration:"slow",animateEasing:"swing",aspectRatio:!1,autoHide:!1,containment:!1,ghost:!1,grid:!1,handles:"e,s,se",helper:!1,maxHeight:null,maxWidth:null,minHeight:10,minWidth:10,zIndex:90,resize:null,start:null,stop:null},_create:function(){var t,i,s,n,a,o=this,r=this.options;if(this.element.addClass("ui-resizable"),e.extend(this,{_aspectRatio:!!r.aspectRatio,aspectRatio:r.aspectRatio,originalElement:this.element,_proportionallyResizeElements:[],_helper:r.helper||r.ghost||r.animate?r.helper||"ui-resizable-helper":null}),this.element[0].nodeName.match(/canvas|textarea|input|select|button|img/i)&&(this.element.wrap(e("<div class='ui-wrapper' style='overflow: hidden;'></div>").css({position:this.element.css("position"),width:this.element.outerWidth(),height:this.element.outerHeight(),top:this.element.css("top"),left:this.element.css("left")})),this.element=this.element.parent().data("ui-resizable",this.element.data("ui-resizable")),this.elementIsWrapper=!0,this.element.css({marginLeft:this.originalElement.css("marginLeft"),marginTop:this.originalElement.css("marginTop"),marginRight:this.originalElement.css("marginRight"),marginBottom:this.originalElement.css("marginBottom")}),this.originalElement.css({marginLeft:0,marginTop:0,marginRight:0,marginBottom:0}),this.originalResizeStyle=this.originalElement.css("resize"),this.originalElement.css("resize","none"),this._proportionallyResizeElements.push(this.originalElement.css({position:"static",zoom:1,display:"block"})),this.originalElement.css({margin:this.originalElement.css("margin")}),this._proportionallyResize()),this.handles=r.handles||(e(".ui-resizable-handle",this.element).length?{n:".ui-resizable-n",e:".ui-resizable-e",s:".ui-resizable-s",w:".ui-resizable-w",se:".ui-resizable-se",sw:".ui-resizable-sw",ne:".ui-resizable-ne",nw:".ui-resizable-nw"}:"e,s,se"),this.handles.constructor===String)for("all"===this.handles&&(this.handles="n,e,s,w,se,sw,ne,nw"),t=this.handles.split(","),this.handles={},i=0;t.length>i;i++)s=e.trim(t[i]),a="ui-resizable-"+s,n=e("<div class='ui-resizable-handle "+a+"'></div>"),n.css({zIndex:r.zIndex}),"se"===s&&n.addClass("ui-icon ui-icon-gripsmall-diagonal-se"),this.handles[s]=".ui-resizable-"+s,this.element.append(n);this._renderAxis=function(t){var i,s,n,a;t=t||this.element;for(i in this.handles)this.handles[i].constructor===String&&(this.handles[i]=e(this.handles[i],this.element).show()),this.elementIsWrapper&&this.originalElement[0].nodeName.match(/textarea|input|select|button/i)&&(s=e(this.handles[i],this.element),a=/sw|ne|nw|se|n|s/.test(i)?s.outerHeight():s.outerWidth(),n=["padding",/ne|nw|n/.test(i)?"Top":/se|sw|s/.test(i)?"Bottom":/^e$/.test(i)?"Right":"Left"].join(""),t.css(n,a),this._proportionallyResize()),e(this.handles[i]).length},this._renderAxis(this.element),this._handles=e(".ui-resizable-handle",this.element).disableSelection(),this._handles.mouseover(function(){o.resizing||(this.className&&(n=this.className.match(/ui-resizable-(se|sw|ne|nw|n|e|s|w)/i)),o.axis=n&&n[1]?n[1]:"se")}),r.autoHide&&(this._handles.hide(),e(this.element).addClass("ui-resizable-autohide").mouseenter(function(){r.disabled||(e(this).removeClass("ui-resizable-autohide"),o._handles.show())}).mouseleave(function(){r.disabled||o.resizing||(e(this).addClass("ui-resizable-autohide"),o._handles.hide())})),this._mouseInit()},_destroy:function(){this._mouseDestroy();var t,i=function(t){e(t).removeClass("ui-resizable ui-resizable-disabled ui-resizable-resizing").removeData("resizable").removeData("ui-resizable").unbind(".resizable").find(".ui-resizable-handle").remove()};return this.elementIsWrapper&&(i(this.element),t=this.element,this.originalElement.css({position:t.css("position"),width:t.outerWidth(),height:t.outerHeight(),top:t.css("top"),left:t.css("left")}).insertAfter(t),t.remove()),this.originalElement.css("resize",this.originalResizeStyle),i(this.originalElement),this},_mouseCapture:function(t){var i,s,n=!1;for(i in this.handles)s=e(this.handles[i])[0],(s===t.target||e.contains(s,t.target))&&(n=!0);return!this.options.disabled&&n},_mouseStart:function(i){var s,n,a,o=this.options,r=this.element.position(),h=this.element;return this.resizing=!0,/absolute/.test(h.css("position"))?h.css({position:"absolute",top:h.css("top"),left:h.css("left")}):h.is(".ui-draggable")&&h.css({position:"absolute",top:r.top,left:r.left}),this._renderProxy(),s=t(this.helper.css("left")),n=t(this.helper.css("top")),o.containment&&(s+=e(o.containment).scrollLeft()||0,n+=e(o.containment).scrollTop()||0),this.offset=this.helper.offset(),this.position={left:s,top:n},this.size=this._helper?{width:h.outerWidth(),height:h.outerHeight()}:{width:h.width(),height:h.height()},this.originalSize=this._helper?{width:h.outerWidth(),height:h.outerHeight()}:{width:h.width(),height:h.height()},this.originalPosition={left:s,top:n},this.sizeDiff={width:h.outerWidth()-h.width(),height:h.outerHeight()-h.height()},this.originalMousePosition={left:i.pageX,top:i.pageY},this.aspectRatio="number"==typeof o.aspectRatio?o.aspectRatio:this.originalSize.width/this.originalSize.height||1,a=e(".ui-resizable-"+this.axis).css("cursor"),e("body").css("cursor","auto"===a?this.axis+"-resize":a),h.addClass("ui-resizable-resizing"),this._propagate("start",i),!0},_mouseDrag:function(t){var i,s=this.helper,n={},a=this.originalMousePosition,o=this.axis,r=this.position.top,h=this.position.left,l=this.size.width,u=this.size.height,c=t.pageX-a.left||0,d=t.pageY-a.top||0,p=this._change[o];return p?(i=p.apply(this,[t,c,d]),this._updateVirtualBoundaries(t.shiftKey),(this._aspectRatio||t.shiftKey)&&(i=this._updateRatio(i,t)),i=this._respectSize(i,t),this._updateCache(i),this._propagate("resize",t),this.position.top!==r&&(n.top=this.position.top+"px"),this.position.left!==h&&(n.left=this.position.left+"px"),this.size.width!==l&&(n.width=this.size.width+"px"),this.size.height!==u&&(n.height=this.size.height+"px"),s.css(n),!this._helper&&this._proportionallyResizeElements.length&&this._proportionallyResize(),e.isEmptyObject(n)||this._trigger("resize",t,this.ui()),!1):!1},_mouseStop:function(t){this.resizing=!1;var i,s,n,a,o,r,h,l=this.options,u=this;return this._helper&&(i=this._proportionallyResizeElements,s=i.length&&/textarea/i.test(i[0].nodeName),n=s&&e.ui.hasScroll(i[0],"left")?0:u.sizeDiff.height,a=s?0:u.sizeDiff.width,o={width:u.helper.width()-a,height:u.helper.height()-n},r=parseInt(u.element.css("left"),10)+(u.position.left-u.originalPosition.left)||null,h=parseInt(u.element.css("top"),10)+(u.position.top-u.originalPosition.top)||null,l.animate||this.element.css(e.extend(o,{top:h,left:r})),u.helper.height(u.size.height),u.helper.width(u.size.width),this._helper&&!l.animate&&this._proportionallyResize()),e("body").css("cursor","auto"),this.element.removeClass("ui-resizable-resizing"),this._propagate("stop",t),this._helper&&this.helper.remove(),!1},_updateVirtualBoundaries:function(e){var t,s,n,a,o,r=this.options;o={minWidth:i(r.minWidth)?r.minWidth:0,maxWidth:i(r.maxWidth)?r.maxWidth:1/0,minHeight:i(r.minHeight)?r.minHeight:0,maxHeight:i(r.maxHeight)?r.maxHeight:1/0},(this._aspectRatio||e)&&(t=o.minHeight*this.aspectRatio,n=o.minWidth/this.aspectRatio,s=o.maxHeight*this.aspectRatio,a=o.maxWidth/this.aspectRatio,t>o.minWidth&&(o.minWidth=t),n>o.minHeight&&(o.minHeight=n),o.maxWidth>s&&(o.maxWidth=s),o.maxHeight>a&&(o.maxHeight=a)),this._vBoundaries=o},_updateCache:function(e){this.offset=this.helper.offset(),i(e.left)&&(this.position.left=e.left),i(e.top)&&(this.position.top=e.top),i(e.height)&&(this.size.height=e.height),i(e.width)&&(this.size.width=e.width)},_updateRatio:function(e){var t=this.position,s=this.size,n=this.axis;return i(e.height)?e.width=e.height*this.aspectRatio:i(e.width)&&(e.height=e.width/this.aspectRatio),"sw"===n&&(e.left=t.left+(s.width-e.width),e.top=null),"nw"===n&&(e.top=t.top+(s.height-e.height),e.left=t.left+(s.width-e.width)),e},_respectSize:function(e){var t=this._vBoundaries,s=this.axis,n=i(e.width)&&t.maxWidth&&t.maxWidth<e.width,a=i(e.height)&&t.maxHeight&&t.maxHeight<e.height,o=i(e.width)&&t.minWidth&&t.minWidth>e.width,r=i(e.height)&&t.minHeight&&t.minHeight>e.height,h=this.originalPosition.left+this.originalSize.width,l=this.position.top+this.size.height,u=/sw|nw|w/.test(s),c=/nw|ne|n/.test(s);return o&&(e.width=t.minWidth),r&&(e.height=t.minHeight),n&&(e.width=t.maxWidth),a&&(e.height=t.maxHeight),o&&u&&(e.left=h-t.minWidth),n&&u&&(e.left=h-t.maxWidth),r&&c&&(e.top=l-t.minHeight),a&&c&&(e.top=l-t.maxHeight),e.width||e.height||e.left||!e.top?e.width||e.height||e.top||!e.left||(e.left=null):e.top=null,e},_proportionallyResize:function(){if(this._proportionallyResizeElements.length){var e,t,i,s,n,a=this.helper||this.element;for(e=0;this._proportionallyResizeElements.length>e;e++){if(n=this._proportionallyResizeElements[e],!this.borderDif)for(this.borderDif=[],i=[n.css("borderTopWidth"),n.css("borderRightWidth"),n.css("borderBottomWidth"),n.css("borderLeftWidth")],s=[n.css("paddingTop"),n.css("paddingRight"),n.css("paddingBottom"),n.css("paddingLeft")],t=0;i.length>t;t++)this.borderDif[t]=(parseInt(i[t],10)||0)+(parseInt(s[t],10)||0);n.css({height:a.height()-this.borderDif[0]-this.borderDif[2]||0,width:a.width()-this.borderDif[1]-this.borderDif[3]||0})}}},_renderProxy:function(){var t=this.element,i=this.options;this.elementOffset=t.offset(),this._helper?(this.helper=this.helper||e("<div style='overflow:hidden;'></div>"),this.helper.addClass(this._helper).css({width:this.element.outerWidth()-1,height:this.element.outerHeight()-1,position:"absolute",left:this.elementOffset.left+"px",top:this.elementOffset.top+"px",zIndex:++i.zIndex}),this.helper.appendTo("body").disableSelection()):this.helper=this.element},_change:{e:function(e,t){return{width:this.originalSize.width+t}},w:function(e,t){var i=this.originalSize,s=this.originalPosition;return{left:s.left+t,width:i.width-t}},n:function(e,t,i){var s=this.originalSize,n=this.originalPosition;return{top:n.top+i,height:s.height-i}},s:function(e,t,i){return{height:this.originalSize.height+i}},se:function(t,i,s){return e.extend(this._change.s.apply(this,arguments),this._change.e.apply(this,[t,i,s]))},sw:function(t,i,s){return e.extend(this._change.s.apply(this,arguments),this._change.w.apply(this,[t,i,s]))},ne:function(t,i,s){return e.extend(this._change.n.apply(this,arguments),this._change.e.apply(this,[t,i,s]))},nw:function(t,i,s){return e.extend(this._change.n.apply(this,arguments),this._change.w.apply(this,[t,i,s]))}},_propagate:function(t,i){e.ui.plugin.call(this,t,[i,this.ui()]),"resize"!==t&&this._trigger(t,i,this.ui())},plugins:{},ui:function(){return{originalElement:this.originalElement,element:this.element,helper:this.helper,position:this.position,size:this.size,originalSize:this.originalSize,originalPosition:this.originalPosition}}}),e.ui.plugin.add("resizable","animate",{stop:function(t){var i=e(this).data("ui-resizable"),s=i.options,n=i._proportionallyResizeElements,a=n.length&&/textarea/i.test(n[0].nodeName),o=a&&e.ui.hasScroll(n[0],"left")?0:i.sizeDiff.height,r=a?0:i.sizeDiff.width,h={width:i.size.width-r,height:i.size.height-o},l=parseInt(i.element.css("left"),10)+(i.position.left-i.originalPosition.left)||null,u=parseInt(i.element.css("top"),10)+(i.position.top-i.originalPosition.top)||null;i.element.animate(e.extend(h,u&&l?{top:u,left:l}:{}),{duration:s.animateDuration,easing:s.animateEasing,step:function(){var s={width:parseInt(i.element.css("width"),10),height:parseInt(i.element.css("height"),10),top:parseInt(i.element.css("top"),10),left:parseInt(i.element.css("left"),10)};n&&n.length&&e(n[0]).css({width:s.width,height:s.height}),i._updateCache(s),i._propagate("resize",t)}})}}),e.ui.plugin.add("resizable","containment",{start:function(){var i,s,n,a,o,r,h,l=e(this).data("ui-resizable"),u=l.options,c=l.element,d=u.containment,p=d instanceof e?d.get(0):/parent/.test(d)?c.parent().get(0):d;p&&(l.containerElement=e(p),/document/.test(d)||d===document?(l.containerOffset={left:0,top:0},l.containerPosition={left:0,top:0},l.parentData={element:e(document),left:0,top:0,width:e(document).width(),height:e(document).height()||document.body.parentNode.scrollHeight}):(i=e(p),s=[],e(["Top","Right","Left","Bottom"]).each(function(e,n){s[e]=t(i.css("padding"+n))}),l.containerOffset=i.offset(),l.containerPosition=i.position(),l.containerSize={height:i.innerHeight()-s[3],width:i.innerWidth()-s[1]},n=l.containerOffset,a=l.containerSize.height,o=l.containerSize.width,r=e.ui.hasScroll(p,"left")?p.scrollWidth:o,h=e.ui.hasScroll(p)?p.scrollHeight:a,l.parentData={element:p,left:n.left,top:n.top,width:r,height:h}))},resize:function(t){var i,s,n,a,o=e(this).data("ui-resizable"),r=o.options,h=o.containerOffset,l=o.position,u=o._aspectRatio||t.shiftKey,c={top:0,left:0},d=o.containerElement;d[0]!==document&&/static/.test(d.css("position"))&&(c=h),l.left<(o._helper?h.left:0)&&(o.size.width=o.size.width+(o._helper?o.position.left-h.left:o.position.left-c.left),u&&(o.size.height=o.size.width/o.aspectRatio),o.position.left=r.helper?h.left:0),l.top<(o._helper?h.top:0)&&(o.size.height=o.size.height+(o._helper?o.position.top-h.top:o.position.top),u&&(o.size.width=o.size.height*o.aspectRatio),o.position.top=o._helper?h.top:0),o.offset.left=o.parentData.left+o.position.left,o.offset.top=o.parentData.top+o.position.top,i=Math.abs((o._helper?o.offset.left-c.left:o.offset.left-c.left)+o.sizeDiff.width),s=Math.abs((o._helper?o.offset.top-c.top:o.offset.top-h.top)+o.sizeDiff.height),n=o.containerElement.get(0)===o.element.parent().get(0),a=/relative|absolute/.test(o.containerElement.css("position")),n&&a&&(i-=o.parentData.left),i+o.size.width>=o.parentData.width&&(o.size.width=o.parentData.width-i,u&&(o.size.height=o.size.width/o.aspectRatio)),s+o.size.height>=o.parentData.height&&(o.size.height=o.parentData.height-s,u&&(o.size.width=o.size.height*o.aspectRatio))},stop:function(){var t=e(this).data("ui-resizable"),i=t.options,s=t.containerOffset,n=t.containerPosition,a=t.containerElement,o=e(t.helper),r=o.offset(),h=o.outerWidth()-t.sizeDiff.width,l=o.outerHeight()-t.sizeDiff.height;t._helper&&!i.animate&&/relative/.test(a.css("position"))&&e(this).css({left:r.left-n.left-s.left,width:h,height:l}),t._helper&&!i.animate&&/static/.test(a.css("position"))&&e(this).css({left:r.left-n.left-s.left,width:h,height:l})}}),e.ui.plugin.add("resizable","alsoResize",{start:function(){var t=e(this).data("ui-resizable"),i=t.options,s=function(t){e(t).each(function(){var t=e(this);t.data("ui-resizable-alsoresize",{width:parseInt(t.width(),10),height:parseInt(t.height(),10),left:parseInt(t.css("left"),10),top:parseInt(t.css("top"),10)})})};"object"!=typeof i.alsoResize||i.alsoResize.parentNode?s(i.alsoResize):i.alsoResize.length?(i.alsoResize=i.alsoResize[0],s(i.alsoResize)):e.each(i.alsoResize,function(e){s(e)})},resize:function(t,i){var s=e(this).data("ui-resizable"),n=s.options,a=s.originalSize,o=s.originalPosition,r={height:s.size.height-a.height||0,width:s.size.width-a.width||0,top:s.position.top-o.top||0,left:s.position.left-o.left||0},h=function(t,s){e(t).each(function(){var t=e(this),n=e(this).data("ui-resizable-alsoresize"),a={},o=s&&s.length?s:t.parents(i.originalElement[0]).length?["width","height"]:["width","height","top","left"];e.each(o,function(e,t){var i=(n[t]||0)+(r[t]||0);i&&i>=0&&(a[t]=i||null)}),t.css(a)})};"object"!=typeof n.alsoResize||n.alsoResize.nodeType?h(n.alsoResize):e.each(n.alsoResize,function(e,t){h(e,t)})},stop:function(){e(this).removeData("resizable-alsoresize")}}),e.ui.plugin.add("resizable","ghost",{start:function(){var t=e(this).data("ui-resizable"),i=t.options,s=t.size;t.ghost=t.originalElement.clone(),t.ghost.css({opacity:.25,display:"block",position:"relative",height:s.height,width:s.width,margin:0,left:0,top:0}).addClass("ui-resizable-ghost").addClass("string"==typeof i.ghost?i.ghost:""),t.ghost.appendTo(t.helper)},resize:function(){var t=e(this).data("ui-resizable");t.ghost&&t.ghost.css({position:"relative",height:t.size.height,width:t.size.width})},stop:function(){var t=e(this).data("ui-resizable");t.ghost&&t.helper&&t.helper.get(0).removeChild(t.ghost.get(0))}}),e.ui.plugin.add("resizable","grid",{resize:function(){var t=e(this).data("ui-resizable"),i=t.options,s=t.size,n=t.originalSize,a=t.originalPosition,o=t.axis,r="number"==typeof i.grid?[i.grid,i.grid]:i.grid,h=r[0]||1,l=r[1]||1,u=Math.round((s.width-n.width)/h)*h,c=Math.round((s.height-n.height)/l)*l,d=n.width+u,p=n.height+c,f=i.maxWidth&&d>i.maxWidth,m=i.maxHeight&&p>i.maxHeight,g=i.minWidth&&i.minWidth>d,v=i.minHeight&&i.minHeight>p;i.grid=r,g&&(d+=h),v&&(p+=l),f&&(d-=h),m&&(p-=l),/^(se|s|e)$/.test(o)?(t.size.width=d,t.size.height=p):/^(ne)$/.test(o)?(t.size.width=d,t.size.height=p,t.position.top=a.top-c):/^(sw)$/.test(o)?(t.size.width=d,t.size.height=p,t.position.left=a.left-u):(t.size.width=d,t.size.height=p,t.position.top=a.top-c,t.position.left=a.left-u)}})})(jQuery);
\ No newline at end of file
diff --git a/.presentx/static/notes.css b/.presentx/static/notes.css
new file mode 100644
index 0000000..9a897be
--- /dev/null
+++ b/.presentx/static/notes.css
@@ -0,0 +1,32 @@
+p {
+  margin: 10px;
+}
+
+#presenter-slides {
+  display: block;
+  margin-top: -10px;
+  margin-left: -17px;
+  position: fixed;
+  border: 0;
+  width: 146%;
+  height: 750px;
+
+  transform: scale(0.7, 0.7);
+  transform-origin: top left;
+  -moz-transform: scale(0.7);
+  -moz-transform-origin: top left;
+  -o-transform: scale(0.7);
+  -o-transform-origin: top left;
+  -webkit-transform: scale(0.7);
+  -webkit-transform-origin: top left;
+}
+
+#presenter-notes {
+  margin-top: -180px;
+  font-family: 'Open Sans', Arial, sans-serif;
+  height: 30%;
+  width: 100%;
+  overflow: scroll;
+  position: fixed;
+  top: 706px;
+}
diff --git a/.presentx/static/notes.js b/.presentx/static/notes.js
new file mode 100644
index 0000000..a6d327f
--- /dev/null
+++ b/.presentx/static/notes.js
@@ -0,0 +1,175 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Store child window object which will display slides with notes
+var notesWindow = null;
+
+var isParentWindow = window.parent == window;
+
+// When parent window closes, clear storage and close child window
+if (isParentWindow) {
+  window.onbeforeunload = function() {
+    localStorage.clear();
+    if (notesWindow) notesWindow.close();
+  };
+}
+
+function toggleNotesWindow() {
+  if (!isParentWindow) return;
+  if (notesWindow) {
+    notesWindow.close();
+    notesWindow = null;
+    return;
+  }
+
+  initNotes();
+}
+
+// Create an unique key for the local storage so we don't mix the
+// destSlide of different presentations. For golang.org/issue/24688.
+function destSlideKey() {
+  var key = '';
+  if (notesWindow) {
+    var slides = notesWindow.document.getElementById('presenter-slides');
+    key = slides.src.split('#')[0];
+  } else {
+    key = window.location.href.split('#')[0];
+  }
+  return 'destSlide:' + key;
+}
+
+function initNotes() {
+  notesWindow = window.open('', '', 'width=1000,height=700');
+  var w = notesWindow;
+  var slidesUrl = window.location.href;
+
+  // Hack to apply css. Requires existing html on notesWindow.
+  w.document.write("<div style='display:none;'></div>");
+
+  w.document.title = window.document.title;
+
+  var slides = w.document.createElement('iframe');
+  slides.id = 'presenter-slides';
+  slides.src = slidesUrl;
+  w.document.body.appendChild(slides);
+
+  var curSlide = parseInt(localStorage.getItem(destSlideKey()), 10);
+  var formattedNotes = '';
+  var section = sections[curSlide - 1];
+  // curSlide is 0 when initialized from the first page of slides.
+  // Check if section is valid before retrieving Notes.
+  if (section) {
+    formattedNotes = formatNotes(section.Notes);
+  } else if (curSlide == 0) {
+    formattedNotes = formatNotes(titleNotes);
+  }
+
+  // setTimeout needed for Firefox
+  setTimeout(function() {
+    slides.focus();
+  }, 100);
+
+  var notes = w.document.createElement('div');
+  notes.id = 'presenter-notes';
+  notes.innerHTML = formattedNotes;
+  w.document.body.appendChild(notes);
+
+  w.document.close();
+
+  function addPresenterNotesStyle() {
+    var el = w.document.createElement('link');
+    el.rel = 'stylesheet';
+    el.type = 'text/css';
+    el.href = PERMANENT_URL_PREFIX + 'notes.css';
+    w.document.body.appendChild(el);
+    w.document.querySelector('head').appendChild(el);
+  }
+
+  addPresenterNotesStyle();
+
+  // Add listener on notesWindow to update notes when triggered from
+  // parent window
+  w.addEventListener('storage', updateNotes, false);
+}
+
+function formatNotes(notes) {
+  var formattedNotes = '';
+  if (notes) {
+    for (var i = 0; i < notes.length; i++) {
+      formattedNotes = formattedNotes + '<p>' + notes[i] + '</p>';
+    }
+  }
+  return formattedNotes;
+}
+
+function updateNotes() {
+  // When triggered from parent window, notesWindow is null
+  // The storage event listener on notesWindow will update notes
+  if (!notesWindow) return;
+  var destSlide = parseInt(localStorage.getItem(destSlideKey()), 10);
+  var section = sections[destSlide - 1];
+  var el = notesWindow.document.getElementById('presenter-notes');
+
+  if (!el) return;
+
+  if (section && section.Notes) {
+    el.innerHTML = formatNotes(section.Notes);
+  } else if (destSlide == 0) {
+    el.innerHTML = formatNotes(titleNotes);
+  } else {
+    el.innerHTML = '';
+  }
+}
+
+/* Playground syncing */
+
+// When presenter notes are enabled, playground click handlers are
+// stored here to sync click events on the correct playground
+var playgroundHandlers = { onRun: [], onKill: [], onClose: [] };
+
+function updatePlay(e) {
+  var i = localStorage.getItem('play-index');
+
+  switch (e.key) {
+    case 'play-index':
+      return;
+    case 'play-action':
+      // Sync 'run', 'kill', 'close' actions
+      var action = localStorage.getItem('play-action');
+      playgroundHandlers[action][i](e);
+      return;
+    case 'play-code':
+      // Sync code editing
+      var play = document.querySelectorAll('div.playground')[i];
+      play.innerHTML = localStorage.getItem('play-code');
+      return;
+    case 'output-style':
+      // Sync resizing of playground output
+      var out = document.querySelectorAll('.output')[i];
+      out.style = localStorage.getItem('output-style');
+      return;
+  }
+}
+
+// Reset 'run', 'kill', 'close' storage items when synced
+// so that successive actions can be synced correctly
+function updatePlayStorage(action, index, e) {
+  localStorage.setItem('play-index', index);
+
+  if (localStorage.getItem('play-action') === action) {
+    // We're the receiving window, and the message has been received
+    localStorage.removeItem('play-action');
+  } else {
+    // We're the triggering window, send the message
+    localStorage.setItem('play-action', action);
+  }
+
+  if (action === 'onRun') {
+    if (localStorage.getItem('play-shiftKey') === 'true') {
+      localStorage.removeItem('play-shiftKey');
+    } else if (e.shiftKey) {
+      localStorage.setItem('play-shiftKey', e.shiftKey);
+    }
+  }
+}
diff --git a/.presentx/static/prism-github-dark.css b/.presentx/static/prism-github-dark.css
new file mode 100644
index 0000000..f4dfadc
--- /dev/null
+++ b/.presentx/static/prism-github-dark.css
@@ -0,0 +1,251 @@
+@font-face {
+  font-family: "JetBrains Mono";
+  src: url("https://raw.githubusercontent.com/JetBrains/JetBrainsMono/master/fonts/webfonts/JetBrainsMono-Medium.eot")
+      format("embedded-opentype"),
+    url("https://raw.githubusercontent.com/JetBrains/JetBrainsMono/master/fonts/webfonts/JetBrainsMono-Medium.woff2")
+      format("woff2"),
+    url("https://raw.githubusercontent.com/JetBrains/JetBrainsMono/master/fonts/webfonts/JetBrainsMono-Medium.woff")
+      format("woff"),
+    url("https://raw.githubusercontent.com/JetBrains/JetBrainsMono/master/fonts/ttf/JetBrainsMono-Medium.ttf")
+      format("truetype");
+  font-weight: normal;
+  font-style: normal;
+}
+
+.slides > article {
+  text-shadow: none !important;
+}
+
+div.code {
+  background: #24292e !important;
+  border-radius: 0.5rem;
+  box-shadow: 0 3px 6px -3px rgba(0, 0, 0.1);
+  padding: 0rem 2rem !important;
+  border: none !important;
+  margin: 0.5em 0;
+  tab-size: 4;
+}
+
+code[class*="language-"],
+pre[class*="language-"] {
+  text-align: left;
+  white-space: pre;
+  word-spacing: normal;
+  word-break: normal;
+  word-wrap: normal;
+  hyphens: none;
+  color: inherit;
+  text-shadow: none;
+  font-family: "JetBrains Mono", monospace;
+  /* set calt to on to enable ligatures */
+  font-feature-settings: "liga" on, "calt" off;
+  -webkit-font-feature-settings: "liga" on, "calt" off;
+  -webkit-font-smoothing: antialiased;
+  text-rendering: optimizeLegibility;
+
+  line-height: 1.3em;
+  font-weight: 500;
+  letter-spacing: 0 !important;
+}
+
+code[class*="language-"]::-moz-selection,
+pre[class*="language-"]::-moz-selection,
+code[class*="language-"] ::-moz-selection,
+pre[class*="language-"] ::-moz-selection {
+  text-shadow: none;
+  opacity: 1;
+  color: #fafbfc;
+  background: #363636;
+}
+
+code[class*="language-"]::selection,
+pre[class*="language-"]::selection,
+code[class*="language-"] ::selection,
+pre[class*="language-"] ::selection {
+  text-shadow: none;
+  opacity: 1;
+  color: #fafbfc;
+  background: #363636;
+}
+
+@media print {
+  code[class*="language-"],
+  pre[class*="language-"] {
+    text-shadow: none !important;
+  }
+}
+
+:not(pre) > code[class*="language-"] {
+  white-space: normal;
+  color: #fafbfc;
+  background: #24292e;
+  border-radius: 0.2em;
+}
+
+pre > code[class*="language-"] {
+  background: none;
+}
+
+pre[class*="language-"] {
+  overflow: auto;
+  position: relative;
+  color: #fafbfc;
+  background: #24292e;
+  border-radius: 0;
+}
+
+pre[class*="language-"].language-css > code,
+pre[class*="language-"].language-sass > code,
+pre[class*="language-"].language-scss > code {
+  color: #fd9170;
+}
+
+[class*="language-"] .namespace {
+  opacity: 0.7;
+}
+
+.token.atrule {
+  color: #ff6171;
+}
+
+.token.attr-name {
+  color: #ffcb6b;
+}
+
+.token.attr-value {
+  color: #b392f0;
+}
+
+.token.attribute {
+  color: #b392f0;
+}
+
+.token.boolean {
+  color: #ff6171;
+}
+
+.token.builtin {
+  color: #ff6171;
+}
+
+.token.cdata {
+  color: #80cbc4;
+}
+
+.token.char {
+  color: #80cbc4;
+}
+
+.token.class {
+  color: #ffcb6b;
+}
+
+.token.class-name {
+  color: #b392f0;
+}
+
+.token.comment {
+  color: #6a737d;
+}
+
+.token.constant {
+  color: #ff6171;
+}
+
+.token.deleted {
+  color: #b392f0;
+}
+
+.token.doctype {
+  color: #6a737d;
+}
+
+.token.entity {
+  color: #b392f0;
+}
+
+.token.function {
+  color: #61a7ff;
+}
+
+.token.hexcode {
+  color: #61a7ff;
+}
+
+.token.id {
+  color: #ff6171;
+  font-weight: bold;
+}
+
+.token.important {
+  color: #ff6171;
+  font-weight: bold;
+}
+
+.token.inserted {
+  color: #80cbc4;
+}
+
+.token.keyword {
+  color: #ff6171;
+}
+
+.token.number {
+  color: #fd9170;
+}
+
+.token.operator {
+  color: #89ddff;
+}
+
+.token.prolog {
+  color: #6a737d;
+}
+
+.token.property {
+  color: #fafbfc;
+}
+
+.token.pseudo-class {
+  color: #b392f0;
+}
+
+.token.pseudo-element {
+  color: #b392f0;
+}
+
+.token.punctuation {
+  color: #89ddff;
+}
+
+.token.regex {
+  color: #61a7ff;
+}
+
+.token.selector {
+  color: #b392f0;
+}
+
+.token.string {
+  color: #a3d0ff;
+}
+
+.token.symbol {
+  color: #ff6171;
+}
+
+.token.tag {
+  color: #b392f0;
+}
+
+.token.unit {
+  color: #fd9170;
+}
+
+.token.url {
+  color: #b392f0;
+}
+
+.token.variable {
+  color: #b392f0;
+}
diff --git a/.presentx/static/prism.css b/.presentx/static/prism.css
new file mode 100644
index 0000000..b1c333d
--- /dev/null
+++ b/.presentx/static/prism.css
@@ -0,0 +1,228 @@
+/* PrismJS 1.22.0
+https://prismjs.com/download.html#themes=prism-tomorrow&languages=clike+go&plugins=line-highlight+line-numbers+remove-initial-line-feed */
+/**
+ * prism.js tomorrow night eighties for JavaScript, CoffeeScript, CSS and HTML
+ * Based on https://github.com/chriskempson/tomorrow-theme
+ * @author Rose Pritchard
+ */
+
+code[class*="language-"],
+pre[class*="language-"] {
+	color: #ccc;
+	caret-color: #ccc;
+	background: none;
+	font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
+	font-size: 0.95em;
+	border-radius: 7px;
+	text-align: left;
+	white-space: pre;
+	word-spacing: normal;
+	word-break: normal;
+	word-wrap: normal;
+	line-height: 1.2;
+
+	-moz-tab-size: 4;
+	-o-tab-size: 4;
+	tab-size: 4;
+
+	-webkit-hyphens: none;
+	-moz-hyphens: none;
+	-ms-hyphens: none;
+	hyphens: none;
+
+}
+
+/* Code blocks */
+pre[class*="language-"] {
+	padding: 0.6em;
+	margin: .5em 0;
+	overflow: auto;
+}
+
+:not(pre) > code[class*="language-"],
+pre[class*="language-"] {
+	background: #2d2d2d;
+}
+
+/* Inline code */
+:not(pre) > code[class*="language-"] {
+	padding: .1em;
+	border-radius: .3em;
+	white-space: normal;
+}
+
+.token.comment,
+.token.block-comment,
+.token.prolog,
+.token.doctype,
+.token.cdata {
+	color: #999;
+}
+
+.token.punctuation {
+	color: #ccc;
+}
+
+.token.tag,
+.token.attr-name,
+.token.namespace,
+.token.deleted {
+	color: #e2777a;
+}
+
+.token.function-name {
+	color: #6196cc;
+}
+
+.token.boolean,
+.token.number,
+.token.function {
+	color: #f08d49;
+}
+
+.token.property,
+.token.class-name,
+.token.constant,
+.token.symbol {
+	color: #f8c555;
+}
+
+.token.selector,
+.token.important,
+.token.atrule,
+.token.keyword,
+.token.builtin {
+	color: #cc99cd;
+}
+
+.token.string,
+.token.char,
+.token.attr-value,
+.token.regex,
+.token.variable {
+	color: #7ec699;
+}
+
+.token.operator,
+.token.entity,
+.token.url {
+	color: #67cdcc;
+}
+
+.token.important,
+.token.bold {
+	font-weight: bold;
+}
+.token.italic {
+	font-style: italic;
+}
+
+.token.entity {
+	cursor: help;
+}
+
+.token.inserted {
+	color: green;
+}
+
+pre[data-line] {
+	position: relative;
+	padding: 1em 0 1em 3em;
+}
+
+.line-highlight {
+	position: absolute;
+	left: 0;
+	right: 0;
+	padding: inherit 0;
+	margin-top: 1em; /* Same as .prism’s padding-top */
+
+	background: hsla(24, 20%, 50%,.08);
+	background: linear-gradient(to right, hsla(24, 20%, 50%,.1) 70%, hsla(24, 20%, 50%,0));
+
+	pointer-events: none;
+
+	line-height: inherit;
+	white-space: pre;
+}
+
+	.line-highlight:before,
+	.line-highlight[data-end]:after {
+		content: attr(data-start);
+		position: absolute;
+		top: .4em;
+		left: .6em;
+		min-width: 1em;
+		padding: 0 .5em;
+		background-color: hsla(24, 20%, 50%,.4);
+		color: hsl(24, 20%, 95%);
+		font: bold 65%/1.5 sans-serif;
+		text-align: center;
+		vertical-align: .3em;
+		border-radius: 999px;
+		text-shadow: none;
+		box-shadow: 0 1px white;
+	}
+
+	.line-highlight[data-end]:after {
+		content: attr(data-end);
+		top: auto;
+		bottom: .4em;
+	}
+
+.line-numbers .line-highlight:before,
+.line-numbers .line-highlight:after {
+	content: none;
+}
+
+pre[id].linkable-line-numbers span.line-numbers-rows {
+	pointer-events: all;
+}
+pre[id].linkable-line-numbers span.line-numbers-rows > span:before {
+	cursor: pointer;
+}
+pre[id].linkable-line-numbers span.line-numbers-rows > span:hover:before {
+	background-color: rgba(128, 128, 128, .2);
+}
+
+pre[class*="language-"].line-numbers {
+	position: relative;
+	padding-left: 3.8em;
+	counter-reset: linenumber;
+}
+
+pre[class*="language-"].line-numbers > code {
+	position: relative;
+	white-space: inherit;
+}
+
+.line-numbers .line-numbers-rows {
+	position: absolute;
+	pointer-events: none;
+	top: 0;
+	font-size: 100%;
+	left: -3.8em;
+	width: 3em; /* works for line-numbers below 1000 lines */
+	letter-spacing: -1px;
+	border-right: 1px solid #999;
+
+	-webkit-user-select: none;
+	-moz-user-select: none;
+	-ms-user-select: none;
+	user-select: none;
+
+}
+
+	.line-numbers-rows > span {
+		display: block;
+		counter-increment: linenumber;
+	}
+
+		.line-numbers-rows > span:before {
+			content: counter(linenumber);
+			color: #999;
+			display: block;
+			padding-right: 0.8em;
+			text-align: right;
+		}
+
diff --git a/.presentx/static/prism.js b/.presentx/static/prism.js
new file mode 100644
index 0000000..4e802fe
--- /dev/null
+++ b/.presentx/static/prism.js
@@ -0,0 +1,6 @@
+/* PrismJS 1.22.0
+https://prismjs.com/download.html#themes=prism-tomorrow&languages=clike+go&plugins=normalize-whitespace */
+var _self="undefined"!=typeof window?window:"undefined"!=typeof WorkerGlobalScope&&self instanceof WorkerGlobalScope?self:{},Prism=function(u){var c=/\blang(?:uage)?-([\w-]+)\b/i,n=0,M={manual:u.Prism&&u.Prism.manual,disableWorkerMessageHandler:u.Prism&&u.Prism.disableWorkerMessageHandler,util:{encode:function e(n){return n instanceof W?new W(n.type,e(n.content),n.alias):Array.isArray(n)?n.map(e):n.replace(/&/g,"&amp;").replace(/</g,"&lt;").replace(/\u00a0/g," ")},type:function(e){return Object.prototype.toString.call(e).slice(8,-1)},objId:function(e){return e.__id||Object.defineProperty(e,"__id",{value:++n}),e.__id},clone:function t(e,r){var a,n;switch(r=r||{},M.util.type(e)){case"Object":if(n=M.util.objId(e),r[n])return r[n];for(var i in a={},r[n]=a,e)e.hasOwnProperty(i)&&(a[i]=t(e[i],r));return a;case"Array":return n=M.util.objId(e),r[n]?r[n]:(a=[],r[n]=a,e.forEach(function(e,n){a[n]=t(e,r)}),a);default:return e}},getLanguage:function(e){for(;e&&!c.test(e.className);)e=e.parentElement;return e?(e.className.match(c)||[,"none"])[1].toLowerCase():"none"},currentScript:function(){if("undefined"==typeof document)return null;if("currentScript"in document)return document.currentScript;try{throw new Error}catch(e){var n=(/at [^(\r\n]*\((.*):.+:.+\)$/i.exec(e.stack)||[])[1];if(n){var t=document.getElementsByTagName("script");for(var r in t)if(t[r].src==n)return t[r]}return null}},isActive:function(e,n,t){for(var r="no-"+n;e;){var a=e.classList;if(a.contains(n))return!0;if(a.contains(r))return!1;e=e.parentElement}return!!t}},languages:{extend:function(e,n){var t=M.util.clone(M.languages[e]);for(var r in n)t[r]=n[r];return t},insertBefore:function(t,e,n,r){var a=(r=r||M.languages)[t],i={};for(var l in a)if(a.hasOwnProperty(l)){if(l==e)for(var o in n)n.hasOwnProperty(o)&&(i[o]=n[o]);n.hasOwnProperty(l)||(i[l]=a[l])}var s=r[t];return r[t]=i,M.languages.DFS(M.languages,function(e,n){n===s&&e!=t&&(this[e]=i)}),i},DFS:function e(n,t,r,a){a=a||{};var i=M.util.objId;for(var l in n)if(n.hasOwnProperty(l)){t.call(n,l,n[l],r||l);var o=n[l],s=M.util.type(o);"Object"!==s||a[i(o)]?"Array"!==s||a[i(o)]||(a[i(o)]=!0,e(o,t,l,a)):(a[i(o)]=!0,e(o,t,null,a))}}},plugins:{},highlightAll:function(e,n){M.highlightAllUnder(document,e,n)},highlightAllUnder:function(e,n,t){var r={callback:t,container:e,selector:'code[class*="language-"], [class*="language-"] code, code[class*="lang-"], [class*="lang-"] code'};M.hooks.run("before-highlightall",r),r.elements=Array.prototype.slice.apply(r.container.querySelectorAll(r.selector)),M.hooks.run("before-all-elements-highlight",r);for(var a,i=0;a=r.elements[i++];)M.highlightElement(a,!0===n,r.callback)},highlightElement:function(e,n,t){var r=M.util.getLanguage(e),a=M.languages[r];e.className=e.className.replace(c,"").replace(/\s+/g," ")+" language-"+r;var i=e.parentElement;i&&"pre"===i.nodeName.toLowerCase()&&(i.className=i.className.replace(c,"").replace(/\s+/g," ")+" language-"+r);var l={element:e,language:r,grammar:a,code:e.textContent};function o(e){l.highlightedCode=e,M.hooks.run("before-insert",l),l.element.innerHTML=l.highlightedCode,M.hooks.run("after-highlight",l),M.hooks.run("complete",l),t&&t.call(l.element)}if(M.hooks.run("before-sanity-check",l),!l.code)return M.hooks.run("complete",l),void(t&&t.call(l.element));if(M.hooks.run("before-highlight",l),l.grammar)if(n&&u.Worker){var s=new Worker(M.filename);s.onmessage=function(e){o(e.data)},s.postMessage(JSON.stringify({language:l.language,code:l.code,immediateClose:!0}))}else o(M.highlight(l.code,l.grammar,l.language));else o(M.util.encode(l.code))},highlight:function(e,n,t){var r={code:e,grammar:n,language:t};return M.hooks.run("before-tokenize",r),r.tokens=M.tokenize(r.code,r.grammar),M.hooks.run("after-tokenize",r),W.stringify(M.util.encode(r.tokens),r.language)},tokenize:function(e,n){var t=n.rest;if(t){for(var r in t)n[r]=t[r];delete n.rest}var a=new i;return I(a,a.head,e),function e(n,t,r,a,i,l){for(var o in r)if(r.hasOwnProperty(o)&&r[o]){var s=r[o];s=Array.isArray(s)?s:[s];for(var u=0;u<s.length;++u){if(l&&l.cause==o+","+u)return;var c=s[u],g=c.inside,f=!!c.lookbehind,h=!!c.greedy,d=0,v=c.alias;if(h&&!c.pattern.global){var p=c.pattern.toString().match(/[imsuy]*$/)[0];c.pattern=RegExp(c.pattern.source,p+"g")}for(var m=c.pattern||c,y=a.next,k=i;y!==t.tail&&!(l&&k>=l.reach);k+=y.value.length,y=y.next){var b=y.value;if(t.length>n.length)return;if(!(b instanceof W)){var x=1;if(h&&y!=t.tail.prev){m.lastIndex=k;var w=m.exec(n);if(!w)break;var A=w.index+(f&&w[1]?w[1].length:0),P=w.index+w[0].length,S=k;for(S+=y.value.length;S<=A;)y=y.next,S+=y.value.length;if(S-=y.value.length,k=S,y.value 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I(e,n,t){var r=n.next,a={value:t,prev:n,next:r};return n.next=a,r.prev=a,e.length++,a}function z(e,n,t){for(var r=n.next,a=0;a<t&&r!==e.tail;a++)r=r.next;(n.next=r).prev=n,e.length-=a}if(u.Prism=M,W.stringify=function n(e,t){if("string"==typeof e)return e;if(Array.isArray(e)){var r="";return e.forEach(function(e){r+=n(e,t)}),r}var a={type:e.type,content:n(e.content,t),tag:"span",classes:["token",e.type],attributes:{},language:t},i=e.alias;i&&(Array.isArray(i)?Array.prototype.push.apply(a.classes,i):a.classes.push(i)),M.hooks.run("wrap",a);var l="";for(var o in a.attributes)l+=" "+o+'="'+(a.attributes[o]||"").replace(/"/g,"&quot;")+'"';return"<"+a.tag+' class="'+a.classes.join(" ")+'"'+l+">"+a.content+"</"+a.tag+">"},!u.document)return u.addEventListener&&(M.disableWorkerMessageHandler||u.addEventListener("message",function(e){var n=JSON.parse(e.data),t=n.language,r=n.code,a=n.immediateClose;u.postMessage(M.highlight(r,M.languages[t],t)),a&&u.close()},!1)),M;var e=M.util.currentScript();function t(){M.manual||M.highlightAll()}if(e&&(M.filename=e.src,e.hasAttribute("data-manual")&&(M.manual=!0)),!M.manual){var r=document.readyState;"loading"===r||"interactive"===r&&e&&e.defer?document.addEventListener("DOMContentLoaded",t):window.requestAnimationFrame?window.requestAnimationFrame(t):window.setTimeout(t,16)}return M}(_self);"undefined"!=typeof module&&module.exports&&(module.exports=Prism),"undefined"!=typeof global&&(global.Prism=Prism);
+Prism.languages.clike={comment:[{pattern:/(^|[^\\])\/\*[\s\S]*?(?:\*\/|$)/,lookbehind:!0},{pattern:/(^|[^\\:])\/\/.*/,lookbehind:!0,greedy:!0}],string:{pattern:/(["'])(?:\\(?:\r\n|[\s\S])|(?!\1)[^\\\r\n])*\1/,greedy:!0},"class-name":{pattern:/(\b(?:class|interface|extends|implements|trait|instanceof|new)\s+|\bcatch\s+\()[\w.\\]+/i,lookbehind:!0,inside:{punctuation:/[.\\]/}},keyword:/\b(?:if|else|while|do|for|return|in|instanceof|function|new|try|throw|catch|finally|null|break|continue)\b/,boolean:/\b(?:true|false)\b/,function:/\w+(?=\()/,number:/\b0x[\da-f]+\b|(?:\b\d+\.?\d*|\B\.\d+)(?:e[+-]?\d+)?/i,operator:/[<>]=?|[!=]=?=?|--?|\+\+?|&&?|\|\|?|[?*/~^%]/,punctuation:/[{}[\];(),.:]/};
+Prism.languages.go=Prism.languages.extend("clike",{keyword:/\b(?:break|case|chan|const|continue|default|defer|else|fallthrough|for|func|go(?:to)?|if|import|interface|map|package|range|return|select|struct|switch|type|var)\b/,builtin:/\b(?:bool|byte|complex(?:64|128)|error|float(?:32|64)|rune|string|u?int(?:8|16|32|64)?|uintptr|append|cap|close|complex|copy|delete|imag|len|make|new|panic|print(?:ln)?|real|recover)\b/,boolean:/\b(?:_|iota|nil|true|false)\b/,operator:/[*\/%^!=]=?|\+[=+]?|-[=-]?|\|[=|]?|&(?:=|&|\^=?)?|>(?:>=?|=)?|<(?:<=?|=|-)?|:=|\.\.\./,number:/(?:\b0x[a-f\d]+|(?:\b\d+\.?\d*|\B\.\d+)(?:e[-+]?\d+)?)i?/i,string:{pattern:/(["'`])(?:\\[\s\S]|(?!\1)[^\\])*\1/,greedy:!0}}),delete Prism.languages.go["class-name"];
+!function(){var i=Object.assign||function(e,n){for(var t in n)n.hasOwnProperty(t)&&(e[t]=n[t]);return e};function e(e){this.defaults=i({},e)}function s(e){for(var n=0,t=0;t<e.length;++t)e.charCodeAt(t)=="\t".charCodeAt(0)&&(n+=3);return e.length+n}e.prototype={setDefaults:function(e){this.defaults=i(this.defaults,e)},normalize:function(e,n){for(var t in n=i(this.defaults,n)){var r=t.replace(/-(\w)/g,function(e,n){return n.toUpperCase()});"normalize"!==t&&"setDefaults"!==r&&n[t]&&this[r]&&(e=this[r].call(this,e,n[t]))}return e},leftTrim:function(e){return e.replace(/^\s+/,"")},rightTrim:function(e){return e.replace(/\s+$/,"")},tabsToSpaces:function(e,n){return n=0|n||4,e.replace(/\t/g,new Array(++n).join(" "))},spacesToTabs:function(e,n){return n=0|n||4,e.replace(RegExp(" {"+n+"}","g"),"\t")},removeTrailing:function(e){return e.replace(/\s*?$/gm,"")},removeInitialLineFeed:function(e){return e.replace(/^(?:\r?\n|\r)/,"")},removeIndent:function(e){var n=e.match(/^[^\S\n\r]*(?=\S)/gm);return n&&n[0].length?(n.sort(function(e,n){return e.length-n.length}),n[0].length?e.replace(RegExp("^"+n[0],"gm"),""):e):e},indent:function(e,n){return e.replace(/^[^\S\n\r]*(?=\S)/gm,new Array(++n).join("\t")+"$&")},breakLines:function(e,n){n=!0===n?80:0|n||80;for(var t=e.split("\n"),r=0;r<t.length;++r)if(!(s(t[r])<=n)){for(var i=t[r].split(/(\s+)/g),o=0,a=0;a<i.length;++a){var l=s(i[a]);n<(o+=l)&&(i[a]="\n"+i[a],o=l)}t[r]=i.join("")}return t.join("\n")}},"undefined"!=typeof module&&module.exports&&(module.exports=e),"undefined"!=typeof Prism&&(Prism.plugins.NormalizeWhitespace=new e({"remove-trailing":!0,"remove-indent":!0,"left-trim":!0,"right-trim":!0}),Prism.hooks.add("before-sanity-check",function(e){var n=Prism.plugins.NormalizeWhitespace;if((!e.settings||!1!==e.settings["whitespace-normalization"])&&Prism.util.isActive(e.element,"whitespace-normalization",!0))if(e.element&&e.element.parentNode||!e.code){var t=e.element.parentNode;if(e.code&&t&&"pre"===t.nodeName.toLowerCase()){for(var r=t.childNodes,i="",o="",a=!1,l=0;l<r.length;++l){var s=r[l];s==e.element?a=!0:"#text"===s.nodeName&&(a?o+=s.nodeValue:i+=s.nodeValue,t.removeChild(s),--l)}if(e.element.children.length&&Prism.plugins.KeepMarkup){var c=i+e.element.innerHTML+o;e.element.innerHTML=n.normalize(c,e.settings),e.code=e.element.textContent}else e.code=i+e.code+o,e.code=n.normalize(e.code,e.settings)}}else e.code=n.normalize(e.code,e.settings)}))}();
diff --git a/.presentx/static/slides.js b/.presentx/static/slides.js
new file mode 100644
index 0000000..7c1229e
--- /dev/null
+++ b/.presentx/static/slides.js
@@ -0,0 +1,635 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+var PERMANENT_URL_PREFIX = '/static/';
+
+var SLIDE_CLASSES = ['far-past', 'past', 'current', 'next', 'far-next'];
+
+var PM_TOUCH_SENSITIVITY = 15;
+
+var curSlide;
+
+/* ---------------------------------------------------------------------- */
+/* classList polyfill by Eli Grey
+ * (http://purl.eligrey.com/github/classList.js/blob/master/classList.js) */
+
+if (
+  typeof document !== 'undefined' &&
+  !('classList' in document.createElement('a'))
+) {
+  (function(view) {
+    var classListProp = 'classList',
+      protoProp = 'prototype',
+      elemCtrProto = (view.HTMLElement || view.Element)[protoProp],
+      objCtr = Object;
+    (strTrim =
+      String[protoProp].trim ||
+      function() {
+        return this.replace(/^\s+|\s+$/g, '');
+      }),
+      (arrIndexOf =
+        Array[protoProp].indexOf ||
+        function(item) {
+          for (var i = 0, len = this.length; i < len; i++) {
+            if (i in this && this[i] === item) {
+              return i;
+            }
+          }
+          return -1;
+        }),
+      // Vendors: please allow content code to instantiate DOMExceptions
+      (DOMEx = function(type, message) {
+        this.name = type;
+        this.code = DOMException[type];
+        this.message = message;
+      }),
+      (checkTokenAndGetIndex = function(classList, token) {
+        if (token === '') {
+          throw new DOMEx(
+            'SYNTAX_ERR',
+            'An invalid or illegal string was specified'
+          );
+        }
+        if (/\s/.test(token)) {
+          throw new DOMEx(
+            'INVALID_CHARACTER_ERR',
+            'String contains an invalid character'
+          );
+        }
+        return arrIndexOf.call(classList, token);
+      }),
+      (ClassList = function(elem) {
+        var trimmedClasses = strTrim.call(elem.className),
+          classes = trimmedClasses ? trimmedClasses.split(/\s+/) : [];
+        for (var i = 0, len = classes.length; i < len; i++) {
+          this.push(classes[i]);
+        }
+        this._updateClassName = function() {
+          elem.className = this.toString();
+        };
+      }),
+      (classListProto = ClassList[protoProp] = []),
+      (classListGetter = function() {
+        return new ClassList(this);
+      });
+    // Most DOMException implementations don't allow calling DOMException's toString()
+    // on non-DOMExceptions. Error's toString() is sufficient here.
+    DOMEx[protoProp] = Error[protoProp];
+    classListProto.item = function(i) {
+      return this[i] || null;
+    };
+    classListProto.contains = function(token) {
+      token += '';
+      return checkTokenAndGetIndex(this, token) !== -1;
+    };
+    classListProto.add = function(token) {
+      token += '';
+      if (checkTokenAndGetIndex(this, token) === -1) {
+        this.push(token);
+        this._updateClassName();
+      }
+    };
+    classListProto.remove = function(token) {
+      token += '';
+      var index = checkTokenAndGetIndex(this, token);
+      if (index !== -1) {
+        this.splice(index, 1);
+        this._updateClassName();
+      }
+    };
+    classListProto.toggle = function(token) {
+      token += '';
+      if (checkTokenAndGetIndex(this, token) === -1) {
+        this.add(token);
+      } else {
+        this.remove(token);
+      }
+    };
+    classListProto.toString = function() {
+      return this.join(' ');
+    };
+
+    if (objCtr.defineProperty) {
+      var classListPropDesc = {
+        get: classListGetter,
+        enumerable: true,
+        configurable: true,
+      };
+      try {
+        objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
+      } catch (ex) {
+        // IE 8 doesn't support enumerable:true
+        if (ex.number === -0x7ff5ec54) {
+          classListPropDesc.enumerable = false;
+          objCtr.defineProperty(elemCtrProto, classListProp, classListPropDesc);
+        }
+      }
+    } else if (objCtr[protoProp].__defineGetter__) {
+      elemCtrProto.__defineGetter__(classListProp, classListGetter);
+    }
+  })(self);
+}
+/* ---------------------------------------------------------------------- */
+
+/* Slide movement */
+
+function hideHelpText() {
+  document.getElementById('help').style.display = 'none';
+}
+
+function getSlideEl(no) {
+  if (no < 0 || no >= slideEls.length) {
+    return null;
+  } else {
+    return slideEls[no];
+  }
+}
+
+function updateSlideClass(slideNo, className) {
+  var el = getSlideEl(slideNo);
+
+  if (!el) {
+    return;
+  }
+
+  if (className) {
+    el.classList.add(className);
+  }
+
+  for (var i in SLIDE_CLASSES) {
+    if (className != SLIDE_CLASSES[i]) {
+      el.classList.remove(SLIDE_CLASSES[i]);
+    }
+  }
+}
+
+function updateSlides() {
+  if (window.trackPageview) window.trackPageview();
+
+  for (var i = 0; i < slideEls.length; i++) {
+    switch (i) {
+      case curSlide - 2:
+        updateSlideClass(i, 'far-past');
+        break;
+      case curSlide - 1:
+        updateSlideClass(i, 'past');
+        break;
+      case curSlide:
+        updateSlideClass(i, 'current');
+        break;
+      case curSlide + 1:
+        updateSlideClass(i, 'next');
+        break;
+      case curSlide + 2:
+        updateSlideClass(i, 'far-next');
+        break;
+      default:
+        updateSlideClass(i);
+        break;
+    }
+  }
+
+  triggerLeaveEvent(curSlide - 1);
+  triggerEnterEvent(curSlide);
+
+  window.setTimeout(function() {
+    // Hide after the slide
+    disableSlideFrames(curSlide - 2);
+  }, 301);
+
+  enableSlideFrames(curSlide - 1);
+  enableSlideFrames(curSlide + 2);
+
+  updateHash();
+}
+
+function prevSlide() {
+  hideHelpText();
+  if (curSlide > 0) {
+    curSlide--;
+
+    updateSlides();
+  }
+
+  if (notesEnabled) localStorage.setItem(destSlideKey(), curSlide);
+}
+
+function nextSlide() {
+  hideHelpText();
+  if (curSlide < slideEls.length - 1) {
+    curSlide++;
+
+    updateSlides();
+  }
+
+  if (notesEnabled) localStorage.setItem(destSlideKey(), curSlide);
+}
+
+/* Slide events */
+
+function triggerEnterEvent(no) {
+  var el = getSlideEl(no);
+  if (!el) {
+    return;
+  }
+
+  var onEnter = el.getAttribute('onslideenter');
+  if (onEnter) {
+    new Function(onEnter).call(el);
+  }
+
+  var evt = document.createEvent('Event');
+  evt.initEvent('slideenter', true, true);
+  evt.slideNumber = no + 1; // Make it readable
+
+  el.dispatchEvent(evt);
+}
+
+function triggerLeaveEvent(no) {
+  var el = getSlideEl(no);
+  if (!el) {
+    return;
+  }
+
+  var onLeave = el.getAttribute('onslideleave');
+  if (onLeave) {
+    new Function(onLeave).call(el);
+  }
+
+  var evt = document.createEvent('Event');
+  evt.initEvent('slideleave', true, true);
+  evt.slideNumber = no + 1; // Make it readable
+
+  el.dispatchEvent(evt);
+}
+
+/* Touch events */
+
+function handleTouchStart(event) {
+  if (event.touches.length == 1) {
+    touchDX = 0;
+    touchDY = 0;
+
+    touchStartX = event.touches[0].pageX;
+    touchStartY = event.touches[0].pageY;
+
+    document.body.addEventListener('touchmove', handleTouchMove, true);
+    document.body.addEventListener('touchend', handleTouchEnd, true);
+  }
+}
+
+function handleTouchMove(event) {
+  if (event.touches.length > 1) {
+    cancelTouch();
+  } else {
+    touchDX = event.touches[0].pageX - touchStartX;
+    touchDY = event.touches[0].pageY - touchStartY;
+    event.preventDefault();
+  }
+}
+
+function handleTouchEnd(event) {
+  var dx = Math.abs(touchDX);
+  var dy = Math.abs(touchDY);
+
+  if (dx > PM_TOUCH_SENSITIVITY && dy < (dx * 2) / 3) {
+    if (touchDX > 0) {
+      prevSlide();
+    } else {
+      nextSlide();
+    }
+  }
+
+  cancelTouch();
+}
+
+function cancelTouch() {
+  document.body.removeEventListener('touchmove', handleTouchMove, true);
+  document.body.removeEventListener('touchend', handleTouchEnd, true);
+}
+
+/* Preloading frames */
+
+function disableSlideFrames(no) {
+  var el = getSlideEl(no);
+  if (!el) {
+    return;
+  }
+
+  var frames = el.getElementsByTagName('iframe');
+  for (var i = 0, frame; (frame = frames[i]); i++) {
+    disableFrame(frame);
+  }
+}
+
+function enableSlideFrames(no) {
+  var el = getSlideEl(no);
+  if (!el) {
+    return;
+  }
+
+  var frames = el.getElementsByTagName('iframe');
+  for (var i = 0, frame; (frame = frames[i]); i++) {
+    enableFrame(frame);
+  }
+}
+
+function disableFrame(frame) {
+  frame.src = 'about:blank';
+}
+
+function enableFrame(frame) {
+  var src = frame._src;
+
+  if (frame.src != src && src != 'about:blank') {
+    frame.src = src;
+  }
+}
+
+function setupFrames() {
+  var frames = document.querySelectorAll('iframe');
+  for (var i = 0, frame; (frame = frames[i]); i++) {
+    frame._src = frame.src;
+    disableFrame(frame);
+  }
+
+  enableSlideFrames(curSlide);
+  enableSlideFrames(curSlide + 1);
+  enableSlideFrames(curSlide + 2);
+}
+
+function setupInteraction() {
+  /* Clicking and tapping */
+
+  var el = document.createElement('div');
+  el.className = 'slide-area';
+  el.id = 'prev-slide-area';
+  el.addEventListener('click', prevSlide, false);
+  document.querySelector('section.slides').appendChild(el);
+
+  var el = document.createElement('div');
+  el.className = 'slide-area';
+  el.id = 'next-slide-area';
+  el.addEventListener('click', nextSlide, false);
+  document.querySelector('section.slides').appendChild(el);
+
+  /* Swiping */
+
+  document.body.addEventListener('touchstart', handleTouchStart, false);
+}
+
+/* Hash functions */
+
+function getCurSlideFromHash() {
+  var slideNo = parseInt(location.hash.substr(1));
+
+  if (slideNo) {
+    curSlide = slideNo - 1;
+  } else {
+    curSlide = 0;
+  }
+}
+
+function updateHash() {
+  location.replace('#' + (curSlide + 1));
+}
+
+/* Event listeners */
+
+function handleBodyKeyDown(event) {
+  // If we're in a code element, only handle pgup/down.
+  var inCode = event.target.classList.contains('code');
+
+  switch (event.keyCode) {
+    case 78: // 'N' opens presenter notes window
+      if (!inCode && notesEnabled) toggleNotesWindow();
+      break;
+    case 72: // 'H' hides the help text
+    case 27: // escape key
+      if (!inCode) hideHelpText();
+      break;
+
+    case 39: // right arrow
+    case 13: // Enter
+    case 32: // space
+      if (inCode) break;
+    case 34: // PgDn
+      nextSlide();
+      event.preventDefault();
+      break;
+
+    case 37: // left arrow
+    case 8: // Backspace
+      if (inCode) break;
+    case 33: // PgUp
+      prevSlide();
+      event.preventDefault();
+      break;
+
+    case 40: // down arrow
+      if (inCode) break;
+      nextSlide();
+      event.preventDefault();
+      break;
+
+    case 38: // up arrow
+      if (inCode) break;
+      prevSlide();
+      event.preventDefault();
+      break;
+  }
+}
+
+function scaleSmallViewports() {
+  var el = document.querySelector('section.slides');
+  var transform = '';
+  var sWidthPx = 1250;
+  var sHeightPx = 750;
+  var sAspectRatio = sWidthPx / sHeightPx;
+  var wAspectRatio = window.innerWidth / window.innerHeight;
+
+  if (wAspectRatio <= sAspectRatio && window.innerWidth < sWidthPx) {
+    transform = 'scale(' + window.innerWidth / sWidthPx + ')';
+  } else if (window.innerHeight < sHeightPx) {
+    transform = 'scale(' + window.innerHeight / sHeightPx + ')';
+  }
+  el.style.transform = transform;
+}
+
+function addEventListeners() {
+  document.addEventListener('keydown', handleBodyKeyDown, false);
+  var resizeTimeout;
+  window.addEventListener('resize', function() {
+    // throttle resize events
+    window.clearTimeout(resizeTimeout);
+    resizeTimeout = window.setTimeout(function() {
+      resizeTimeout = null;
+      scaleSmallViewports();
+    }, 50);
+  });
+
+  // Force reset transform property of section.slides when printing page.
+  // Use both onbeforeprint and matchMedia for compatibility with different browsers.
+  var beforePrint = function() {
+    var el = document.querySelector('section.slides');
+    el.style.transform = '';
+  };
+  window.onbeforeprint = beforePrint;
+  if (window.matchMedia) {
+    var mediaQueryList = window.matchMedia('print');
+    mediaQueryList.addListener(function(mql) {
+      if (mql.matches) beforePrint();
+    });
+  }
+}
+
+/* Initialization */
+
+function addFontStyle() {
+  var el = document.createElement('link');
+  el.rel = 'stylesheet';
+  el.type = 'text/css';
+  el.href =
+    '//fonts.googleapis.com/css?family=' +
+    'Open+Sans:regular,semibold,italic,italicsemibold|Droid+Sans+Mono';
+
+  document.body.appendChild(el);
+}
+
+function addGeneralStyle() {
+  var el = document.createElement('link');
+  el.rel = 'stylesheet';
+  el.type = 'text/css';
+  el.href = PERMANENT_URL_PREFIX + 'styles.css';
+  document.body.appendChild(el);
+
+  var el = document.createElement('meta');
+  el.name = 'viewport';
+  el.content = 'width=device-width,height=device-height,initial-scale=1';
+  document.querySelector('head').appendChild(el);
+
+  var el = document.createElement('meta');
+  el.name = 'apple-mobile-web-app-capable';
+  el.content = 'yes';
+  document.querySelector('head').appendChild(el);
+
+  scaleSmallViewports();
+}
+
+function handleDomLoaded() {
+  slideEls = document.querySelectorAll('section.slides > article');
+
+  setupFrames();
+
+  addFontStyle();
+  addGeneralStyle();
+  addEventListeners();
+
+  updateSlides();
+
+  setupInteraction();
+
+  if (
+    window.location.hostname == 'localhost' ||
+    window.location.hostname == '127.0.0.1' ||
+    window.location.hostname == '::1'
+  ) {
+    hideHelpText();
+  }
+
+  document.body.classList.add('loaded');
+
+  setupNotesSync();
+}
+
+function initialize() {
+  getCurSlideFromHash();
+
+  if (window['_DEBUG']) {
+    PERMANENT_URL_PREFIX = '../';
+  }
+
+  if (window['_DCL']) {
+    handleDomLoaded();
+  } else {
+    document.addEventListener('DOMContentLoaded', handleDomLoaded, false);
+  }
+}
+
+// If ?debug exists then load the script relative instead of absolute
+if (!window['_DEBUG'] && document.location.href.indexOf('?debug') !== -1) {
+  document.addEventListener(
+    'DOMContentLoaded',
+    function() {
+      // Avoid missing the DomContentLoaded event
+      window['_DCL'] = true;
+    },
+    false
+  );
+
+  window['_DEBUG'] = true;
+  var script = document.createElement('script');
+  script.type = 'text/javascript';
+  script.src = '../slides.js';
+  var s = document.getElementsByTagName('script')[0];
+  s.parentNode.insertBefore(script, s);
+
+  // Remove this script
+  s.parentNode.removeChild(s);
+} else {
+  initialize();
+}
+
+/* Synchronize windows when notes are enabled */
+
+function setupNotesSync() {
+  if (!notesEnabled) return;
+
+  function setupPlayResizeSync() {
+    var out = document.getElementsByClassName('output');
+    for (var i = 0; i < out.length; i++) {
+      $(out[i]).bind('resize', function(event) {
+        if ($(event.target).hasClass('ui-resizable')) {
+          localStorage.setItem('play-index', i);
+          localStorage.setItem('output-style', out[i].style.cssText);
+        }
+      });
+    }
+  }
+  function setupPlayCodeSync() {
+    var play = document.querySelectorAll('div.playground');
+    for (var i = 0; i < play.length; i++) {
+      play[i].addEventListener('input', inputHandler, false);
+
+      function inputHandler(e) {
+        localStorage.setItem('play-index', i);
+        localStorage.setItem('play-code', e.target.innerHTML);
+      }
+    }
+  }
+
+  setupPlayCodeSync();
+  setupPlayResizeSync();
+  localStorage.setItem(destSlideKey(), curSlide);
+  window.addEventListener('storage', updateOtherWindow, false);
+}
+
+// An update to local storage is caught only by the other window
+// The triggering window does not handle any sync actions
+function updateOtherWindow(e) {
+  // Ignore remove storage events which are not meant to update the other window
+  var isRemoveStorageEvent = !e.newValue;
+  if (isRemoveStorageEvent) return;
+
+  var destSlide = localStorage.getItem(destSlideKey());
+  while (destSlide > curSlide) {
+    nextSlide();
+  }
+  while (destSlide < curSlide) {
+    prevSlide();
+  }
+
+  updatePlay(e);
+  updateNotes();
+}
diff --git a/.presentx/static/styles.css b/.presentx/static/styles.css
new file mode 100644
index 0000000..e5367fb
--- /dev/null
+++ b/.presentx/static/styles.css
@@ -0,0 +1,565 @@
+@media screen {
+  /* Framework */
+  html {
+    height: 100%;
+  }
+
+  body {
+    margin: 0;
+    padding: 0;
+
+    display: block !important;
+
+    height: 100%;
+    height: 100vh;
+
+    overflow: hidden;
+
+    background: rgb(215, 215, 215);
+    background: -o-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
+    background: -moz-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
+    background: -webkit-radial-gradient(rgb(240, 240, 240), rgb(190, 190, 190));
+    background: -webkit-gradient(
+      radial,
+      50% 50%,
+      0,
+      50% 50%,
+      500,
+      from(rgb(240, 240, 240)),
+      to(rgb(190, 190, 190))
+    );
+
+    -webkit-font-smoothing: antialiased;
+  }
+
+  .slides {
+    width: 100%;
+    height: 100%;
+    left: 0;
+    top: 0;
+
+    position: absolute;
+
+    -webkit-transform: translate3d(0, 0, 0);
+  }
+
+  .slides > article {
+    display: block;
+
+    position: absolute;
+    overflow: hidden;
+
+    width: 900px;
+    height: 700px;
+
+    left: 50%;
+    top: 50%;
+
+    margin-left: -450px;
+    margin-top: -350px;
+
+    padding: 40px 60px;
+
+    box-sizing: border-box;
+    -o-box-sizing: border-box;
+    -moz-box-sizing: border-box;
+    -webkit-box-sizing: border-box;
+
+    border-radius: 10px;
+    -o-border-radius: 10px;
+    -moz-border-radius: 10px;
+    -webkit-border-radius: 10px;
+
+    background-color: white;
+
+    border: 1px solid rgba(0, 0, 0, 0.3);
+
+    transition: transform 0.3s ease-out;
+    -o-transition: -o-transform 0.3s ease-out;
+    -moz-transition: -moz-transform 0.3s ease-out;
+    -webkit-transition: -webkit-transform 0.3s ease-out;
+  }
+  .slides.layout-widescreen > article {
+    margin-left: -550px;
+    width: 1100px;
+  }
+  .slides.layout-faux-widescreen > article {
+    margin-left: -550px;
+    width: 1100px;
+
+    padding: 40px 160px;
+  }
+
+  .slides.layout-widescreen > article:not(.nobackground):not(.biglogo),
+  .slides.layout-faux-widescreen > article:not(.nobackground):not(.biglogo) {
+    background-position-x: 0, 840px;
+  }
+
+  /* Clickable/tappable areas */
+
+  .slide-area {
+    z-index: 1000;
+
+    position: absolute;
+    left: 0;
+    top: 0;
+    width: 150px;
+    height: 700px;
+
+    left: 50%;
+    top: 50%;
+
+    cursor: pointer;
+    margin-top: -350px;
+
+    tap-highlight-color: transparent;
+    -o-tap-highlight-color: transparent;
+    -moz-tap-highlight-color: transparent;
+    -webkit-tap-highlight-color: transparent;
+  }
+  #prev-slide-area {
+    margin-left: -550px;
+  }
+  #next-slide-area {
+    margin-left: 400px;
+  }
+  .slides.layout-widescreen #prev-slide-area,
+  .slides.layout-faux-widescreen #prev-slide-area {
+    margin-left: -650px;
+  }
+  .slides.layout-widescreen #next-slide-area,
+  .slides.layout-faux-widescreen #next-slide-area {
+    margin-left: 500px;
+  }
+
+  /* Slides */
+
+  .slides > article {
+    display: none;
+  }
+  .slides > article.far-past {
+    display: block;
+    transform: translate(-2040px);
+    -o-transform: translate(-2040px);
+    -moz-transform: translate(-2040px);
+    -webkit-transform: translate3d(-2040px, 0, 0);
+  }
+  .slides > article.past {
+    display: block;
+    transform: translate(-1020px);
+    -o-transform: translate(-1020px);
+    -moz-transform: translate(-1020px);
+    -webkit-transform: translate3d(-1020px, 0, 0);
+  }
+  .slides > article.current {
+    display: block;
+    transform: translate(0);
+    -o-transform: translate(0);
+    -moz-transform: translate(0);
+    -webkit-transform: translate3d(0, 0, 0);
+  }
+  .slides > article.next {
+    display: block;
+    transform: translate(1020px);
+    -o-transform: translate(1020px);
+    -moz-transform: translate(1020px);
+    -webkit-transform: translate3d(1020px, 0, 0);
+  }
+  .slides > article.far-next {
+    display: block;
+    transform: translate(2040px);
+    -o-transform: translate(2040px);
+    -moz-transform: translate(2040px);
+    -webkit-transform: translate3d(2040px, 0, 0);
+  }
+
+  .slides.layout-widescreen > article.far-past,
+  .slides.layout-faux-widescreen > article.far-past {
+    display: block;
+    transform: translate(-2260px);
+    -o-transform: translate(-2260px);
+    -moz-transform: translate(-2260px);
+    -webkit-transform: translate3d(-2260px, 0, 0);
+  }
+  .slides.layout-widescreen > article.past,
+  .slides.layout-faux-widescreen > article.past {
+    display: block;
+    transform: translate(-1130px);
+    -o-transform: translate(-1130px);
+    -moz-transform: translate(-1130px);
+    -webkit-transform: translate3d(-1130px, 0, 0);
+  }
+  .slides.layout-widescreen > article.current,
+  .slides.layout-faux-widescreen > article.current {
+    display: block;
+    transform: translate(0);
+    -o-transform: translate(0);
+    -moz-transform: translate(0);
+    -webkit-transform: translate3d(0, 0, 0);
+  }
+  .slides.layout-widescreen > article.next,
+  .slides.layout-faux-widescreen > article.next {
+    display: block;
+    transform: translate(1130px);
+    -o-transform: translate(1130px);
+    -moz-transform: translate(1130px);
+    -webkit-transform: translate3d(1130px, 0, 0);
+  }
+  .slides.layout-widescreen > article.far-next,
+  .slides.layout-faux-widescreen > article.far-next {
+    display: block;
+    transform: translate(2260px);
+    -o-transform: translate(2260px);
+    -moz-transform: translate(2260px);
+    -webkit-transform: translate3d(2260px, 0, 0);
+  }
+}
+
+@media print {
+  /* Set page layout */
+  @page {
+    size: A4 landscape;
+  }
+
+  body {
+    display: block !important;
+  }
+
+  .slides > article {
+    display: block;
+
+    position: relative;
+
+    page-break-inside: never;
+    page-break-after: always;
+
+    overflow: hidden;
+  }
+
+  h2 {
+    position: static !important;
+    margin-top: 400px !important;
+    margin-bottom: 100px !important;
+  }
+/* legacy - taken over by prism.js
+  div.code {
+    background: rgb(240, 240, 240);
+  } */
+
+  /* Add explicit links */
+  a:link:after,
+  a:visited:after {
+    content: ' (' attr(href) ') ';
+    font-size: 50%;
+  }
+
+  #help {
+    display: none;
+    visibility: hidden;
+  }
+}
+
+/* Styles for slides */
+
+.slides > article {
+  font-family: 'Open Sans', Arial, sans-serif;
+
+  color: black;
+  text-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
+
+  font-size: 26px;
+  line-height: 36px;
+
+  letter-spacing: -1px;
+}
+
+b {
+  font-weight: 600;
+}
+
+a {
+  color: rgb(0, 102, 204);
+  text-decoration: none;
+}
+a:visited {
+  color: rgba(0, 102, 204, 0.75);
+}
+a:hover {
+  color: black;
+}
+
+p {
+  margin: 0;
+  padding: 0;
+
+  margin-top: 20px;
+}
+p:first-child {
+  margin-top: 0;
+}
+
+h1 {
+  font-size: 60px;
+  line-height: 60px;
+
+  padding: 0;
+  margin: 0;
+  margin-top: 200px;
+  margin-bottom: 5px;
+  padding-right: 40px;
+
+  font-weight: 600;
+
+  letter-spacing: -3px;
+
+  color: rgb(51, 51, 51);
+}
+
+h2 {
+  font-size: 45px;
+  line-height: 45px;
+
+  position: absolute;
+  bottom: 150px;
+
+  padding: 0;
+  margin: 0;
+  padding-right: 40px;
+
+  font-weight: 600;
+
+  letter-spacing: -2px;
+
+  color: rgb(51, 51, 51);
+}
+
+h3 {
+  font-size: 30px;
+  line-height: 36px;
+
+  padding: 0;
+  margin: 0;
+  padding-right: 40px;
+
+  font-weight: 600;
+
+  letter-spacing: -1px;
+
+  color: rgb(51, 51, 51);
+}
+
+ul {
+  margin: 0;
+  padding: 0;
+  margin-top: 20px;
+  margin-left: 1.5em;
+}
+li {
+  padding: 0;
+  margin: 0 0 0.5em 0;
+}
+
+/*legacy - taken over by prism.js
+ div.code {
+  padding: 5px 10px;
+  margin-top: 20px;
+  margin-bottom: 20px;
+  overflow: hidden;
+
+  background: rgb(240, 240, 240);
+  border: 1px solid rgb(224, 224, 224);
+} */
+pre {
+  margin: 0;
+  padding: 0;
+
+  font-family: 'Droid Sans Mono', 'Courier New', monospace;
+  font-size: 18px;
+  line-height: 24px;
+  letter-spacing: -1px;
+
+  color: black;
+}
+
+pre.numbers span:before {
+  content: attr(num);
+  margin-right: 1em;
+  display: inline-block;
+}
+
+/* legacy - taken over by prism.js
+code {
+  font-size: 95%;
+  font-family: 'Droid Sans Mono', 'Courier New', monospace;
+
+  color: black;
+} */
+
+article > .image,
+article > .video {
+  text-align: center;
+  margin-top: 40px;
+}
+
+article.background {
+  background-size: contain;
+  background-repeat: round;
+}
+
+table {
+  width: 100%;
+  border-collapse: collapse;
+  margin-top: 40px;
+}
+th {
+  font-weight: 600;
+  text-align: left;
+}
+td,
+th {
+  border: 1px solid rgb(224, 224, 224);
+  padding: 5px 10px;
+  vertical-align: top;
+}
+
+p.link {
+  margin-left: 20px;
+}
+
+.pagenumber {
+  color: #8c8c8c;
+  font-size: 75%;
+  position: absolute;
+  bottom: 0px;
+  right: 10px;
+}
+
+/* Code legacy - taken over by prism.js */
+/* div.code {
+  outline: 0px solid transparent;
+} */
+div.playground {
+  position: relative;
+}
+div.output {
+  position: absolute;
+  left: 50%;
+  top: 50%;
+  right: 40px;
+  bottom: 40px;
+  background: #202020;
+  padding: 5px 10px;
+  z-index: 2;
+
+  border-radius: 10px;
+  -o-border-radius: 10px;
+  -moz-border-radius: 10px;
+  -webkit-border-radius: 10px;
+}
+div.output pre {
+  margin: 0;
+  padding: 0;
+  background: none;
+  border: none;
+  width: 100%;
+  height: 100%;
+  overflow: auto;
+}
+div.output .stdout,
+div.output pre {
+  color: #e6e6e6;
+}
+div.output .stderr,
+div.output .error {
+  color: rgb(255, 200, 200);
+}
+div.output .system,
+div.output .exit {
+  color: rgb(255, 230, 120);
+}
+.buttons {
+  position: relative;
+  float: right;
+  top: -60px;
+  right: 10px;
+}
+div.output .buttons {
+  position: absolute;
+  float: none;
+  top: auto;
+  right: 5px;
+  bottom: 5px;
+}
+
+/* Presenter details */
+.presenter {
+  margin-top: 20px;
+}
+.presenter p,
+.presenter .link {
+  margin: 0;
+  font-size: 28px;
+  line-height: 1.2em;
+}
+
+/* Output resize details */
+.ui-resizable-handle {
+  position: absolute;
+}
+.ui-resizable-n {
+  cursor: n-resize;
+  height: 7px;
+  width: 100%;
+  top: -5px;
+  left: 0;
+}
+.ui-resizable-w {
+  cursor: w-resize;
+  width: 7px;
+  left: -5px;
+  top: 0;
+  height: 100%;
+}
+.ui-resizable-nw {
+  cursor: nw-resize;
+  width: 9px;
+  height: 9px;
+  left: -5px;
+  top: -5px;
+}
+iframe {
+  border: none;
+}
+figcaption {
+  color: #666;
+  text-align: center;
+  font-size: 0.75em;
+}
+
+#help {
+  font-family: 'Open Sans', Arial, sans-serif;
+  text-align: center;
+  color: white;
+  background: #000;
+  opacity: 0.5;
+  position: fixed;
+  bottom: 25px;
+  left: 50px;
+  right: 50px;
+  padding: 20px;
+
+  border-radius: 10px;
+  -o-border-radius: 10px;
+  -moz-border-radius: 10px;
+  -webkit-border-radius: 10px;
+}
+
+code {
+  padding: 0.1em 0.3em;
+  padding-top: 0.1em;
+  padding-bottom: 0.2em;
+  background-color: antiquewhite;
+  font-weight: bold;
+  color: black;
+}
+
diff --git a/.presentx/templates/action.tmpl b/.presentx/templates/action.tmpl
new file mode 100644
index 0000000..943e524
--- /dev/null
+++ b/.presentx/templates/action.tmpl
@@ -0,0 +1,66 @@
+{/*
+This is the action template.
+It determines how the formatting actions are rendered.
+*/}
+
+{{define "section"}}
+  <h{{len .Number}} id="TOC_{{.FormattedNumber}}">{{.FormattedNumber}} {{.Title}}</h{{len .Number}}>
+  {{range .Elem}}{{elem $.Template .}}{{end}}
+{{end}}
+
+{{define "list"}}
+  <ul>
+  {{range .Bullet}}
+    <li>{{style .}}</li>
+  {{end}}
+  </ul>
+{{end}}
+
+{{define "text"}}
+  {{if .Pre}}
+  <div class="code"><pre>{{range .Lines}}{{.}}{{end}}</pre></div>
+  {{else}}
+  <p>
+    {{range $i, $l := .Lines}}{{if $i}}{{template "newline"}}
+    {{end}}{{style $l}}{{end}}
+  </p>
+  {{end}}
+{{end}}
+
+{{define "oldcode"}}
+  <div class="code{{if playable .}} playground{{end}}" {{if .Edit}}contenteditable="true" spellcheck="false"{{end}}>{{.Text}}</div>
+{{end}}
+
+{{define "code"}}
+<div class="code {{if .Edit}}edit{{else}}noedit{{end}}{{if playable .}} playground{{end}}" {{if .Edit}}contenteditable="true" spellcheck="false"{{end}}><pre {{if .Edit}}contenteditable="true" spellcheck="false"{{end}}><code class="code language-go"  >{{.Text}}</code></pre></div>
+{{end}}
+
+{{define "image"}}
+<div class="image">
+  <img src="{{.URL}}"{{with .Height}} height="{{.}}"{{end}}{{with .Width}} width="{{.}}"{{end}}>
+</div>
+{{end}}
+
+{{define "video"}}
+<div class="video">
+  <video {{with .Height}} height="{{.}}"{{end}}{{with .Width}} width="{{.}}"{{end}} controls>
+    <source src="{{.URL}}" type="{{.SourceType}}">
+  </video>
+</div>
+{{end}}
+
+{{define "background"}}
+<div class="background">
+  <img src="{{.URL}}">
+</div>
+{{end}}
+
+{{define "iframe"}}
+<iframe src="{{.URL}}"{{with .Height}} height="{{.}}"{{end}}{{with .Width}} width="{{.}}"{{end}}></iframe>
+{{end}}
+
+{{define "link"}}<p class="link"><a href="{{.URL}}" target="_blank">{{style .Label}}</a></p>{{end}}
+
+{{define "html"}}{{.HTML}}{{end}}
+
+{{define "caption"}}<figcaption>{{style .Text}}</figcaption>{{end}}
diff --git a/.presentx/templates/article.tmpl b/.presentx/templates/article.tmpl
new file mode 100644
index 0000000..0a223c6
--- /dev/null
+++ b/.presentx/templates/article.tmpl
@@ -0,0 +1,98 @@
+{/* This is the article template. It defines how articles are formatted. */}
+
+{{define "root"}}
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>{{.Title}}</title>
+    <link type="text/css" rel="stylesheet" href="/static/article.css">
+    <meta charset='utf-8'>
+    <script>
+      // Initialize Google Analytics tracking code on production site only.
+      if (window["location"] && window["location"]["hostname"] == "talks.golang.org") {
+        var _gaq = _gaq || [];
+        _gaq.push(["_setAccount", "UA-11222381-6"]);
+        _gaq.push(["b._setAccount", "UA-49880327-6"]);
+        window.trackPageview = function() {
+          _gaq.push(["_trackPageview", location.pathname+location.hash]);
+          _gaq.push(["b._trackPageview", location.pathname+location.hash]);
+        };
+        window.trackPageview();
+        window.trackEvent = function(category, action, opt_label, opt_value, opt_noninteraction) {
+          _gaq.push(["_trackEvent", category, action, opt_label, opt_value, opt_noninteraction]);
+          _gaq.push(["b._trackEvent", category, action, opt_label, opt_value, opt_noninteraction]);
+        };
+      }
+    </script>
+  </head>
+
+  <body>
+    <div id="topbar" class="wide">
+      <div class="container">
+        <div id="heading">{{.Title}}
+          {{with .Subtitle}}{{.}}{{end}}
+          {{if .Authors}}
+            {{range .Authors}}
+              <div class="author">
+                {{range .Elem}}{{elem $.Template .}}{{end}}
+              </div>
+            {{end}}
+          {{end}}
+        </div>
+      </div>
+    </div>
+    <div id="page" class="wide">
+      <div class="container">
+        {{with .Sections}}
+          <div id="toc" class="no-print">
+            <div id="tochead">Contents</div>
+            {{template "TOC" .}}
+          </div>
+        {{end}}
+
+        {{range .Sections}}
+          {{elem $.Template .}}
+        {{end}}{{/* of Section block */}}
+
+      </div>
+    </div>
+
+    {{if .PlayEnabled}}
+    <script src='/play.js'></script>
+    {{end}}
+
+    <script>
+      (function() {
+        // Load Google Analytics tracking code on production site only.
+        if (window["location"] && window["location"]["hostname"] == "talks.golang.org") {
+          var ga = document.createElement("script"); ga.type = "text/javascript"; ga.async = true;
+          ga.src = ("https:" == document.location.protocol ? "https://ssl" : "http://www") + ".google-analytics.com/ga.js";
+          var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(ga, s);
+        }
+      })();
+    </script>
+  </body>
+</html>
+{{end}}
+
+{{define "TOC"}}
+  <ul class="toc-outer">
+  {{range .}}
+    <li><a href="#TOC_{{.FormattedNumber}}">{{.Title}}</a></li>
+    {{with .Sections}}{{template "TOC-Inner" .}}{{end}}
+  {{end}}
+  </ul>
+{{end}}
+
+{{define "TOC-Inner"}}
+  <ul class="toc-inner">
+  {{range .}}
+    <li><a href="#TOC_{{.FormattedNumber}}">{{.Title}}</a></li>
+    {{with .Sections}}{{template "TOC-Inner" .}}{{end}}
+  {{end}}
+  </ul>
+{{end}}
+
+{{define "newline"}}
+{{/* No automatic line break. Paragraphs are free-form. */}}
+{{end}}
diff --git a/.presentx/templates/dir.tmpl b/.presentx/templates/dir.tmpl
new file mode 100644
index 0000000..1732623
--- /dev/null
+++ b/.presentx/templates/dir.tmpl
@@ -0,0 +1,108 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+  <title>Talks - The Go Programming Language</title>
+  <link type="text/css" rel="stylesheet" href="/static/dir.css">
+  <script src="/static/dir.js"></script>
+  <script>
+    // Initialize Google Analytics tracking code on production site only.
+    if (window["location"] && window["location"]["hostname"] == "talks.golang.org") {
+      var _gaq = _gaq || [];
+      _gaq.push(["_setAccount", "UA-11222381-6"]);
+      _gaq.push(["b._setAccount", "UA-49880327-6"]);
+      window.trackPageview = function() {
+        _gaq.push(["_trackPageview", location.pathname+location.hash]);
+        _gaq.push(["b._trackPageview", location.pathname+location.hash]);
+      };
+      window.trackPageview();
+      window.trackEvent = function(category, action, opt_label, opt_value, opt_noninteraction) {
+        _gaq.push(["_trackEvent", category, action, opt_label, opt_value, opt_noninteraction]);
+        _gaq.push(["b._trackEvent", category, action, opt_label, opt_value, opt_noninteraction]);
+      };
+    }
+  </script>
+</head>
+<body>
+
+<div id="topbar"><div class="container">
+
+<form method="GET" action="//golang.org/search">
+<div id="menu">
+<a href="http://golang.org/doc/">Documents</a>
+<a href="http://golang.org/ref">References</a>
+<a href="http://golang.org/pkg/">Packages</a>
+<a href="http://golang.org/project/">The Project</a>
+<a href="http://golang.org/help/">Help</a>
+<input type="text" id="search" name="q" class="inactive" value="Search">
+</div>
+<div id="heading"><a href="/">The Go Programming Language</a></div>
+</form>
+
+</div></div>
+
+<div id="page">
+
+  <h1>Go talks</h1>
+
+  {{with .Path}}<h2>{{.}}</h2>{{end}}
+
+  {{with .Articles}}
+  <h4>Articles:</h4>
+  <dl>
+  {{range .}}
+  <dd><a href="/{{.Path}}">{{.Name}}</a>: {{.Title}}</dd>
+  {{end}}
+  </dl>
+  {{end}}
+
+  {{with .Slides}}
+  <h4>Slide decks:</h4>
+  <dl>
+  {{range .}}
+  <dd><a href="/{{.Path}}">{{.Name}}</a>: {{.Title}}</dd>
+  {{end}}
+  </dl>
+  {{end}}
+
+  {{with .Other}}
+  <h4>Files:</h4>
+  <dl>
+  {{range .}}
+  <dd><a href="/{{.Path}}">{{.Name}}</a></dd>
+  {{end}}
+  </dl>
+  {{end}}
+
+  {{with .Dirs}}
+  <h4>Sub-directories:</h4>
+  <dl>
+  {{range .}}
+  <dd><a href="/{{.Path}}">{{.Name}}</a></dd>
+  {{end}}
+  </dl>
+  {{end}}
+
+</div>
+
+<div id="footer">
+Except as <a href="https://developers.google.com/site-policies#restrictions">noted</a>,
+the content of this page is licensed under the
+Creative Commons Attribution 3.0 License,
+and code is licensed under a <a href="http://golang.org/LICENSE">BSD license</a>.<br>
+<a href="http://golang.org/doc/tos.html">Terms of Service</a> |
+<a href="http://www.google.com/intl/en/policies/privacy/">Privacy Policy</a>
+</div>
+
+<script>
+  (function() {
+    // Load Google Analytics tracking code on production site only.
+    if (window["location"] && window["location"]["hostname"] == "talks.golang.org") {
+      var ga = document.createElement("script"); ga.type = "text/javascript"; ga.async = true;
+      ga.src = ("https:" == document.location.protocol ? "https://ssl" : "http://www") + ".google-analytics.com/ga.js";
+      var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(ga, s);
+    }
+  })();
+</script>
+</body>
+</html>
diff --git a/.presentx/templates/slides.tmpl b/.presentx/templates/slides.tmpl
new file mode 100644
index 0000000..6468111
--- /dev/null
+++ b/.presentx/templates/slides.tmpl
@@ -0,0 +1,177 @@
+{/* This is the slide template. It defines how presentations are formatted. */}
+
+{{define "root"}}
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>{{.Title}}</title>
+    <meta charset='utf-8'>
+    <script>
+      var notesEnabled = {{.NotesEnabled}};
+    </script>
+    <script src='/static/slides.js'></script>
+    <link href="/static/prism-github-dark.css" rel="stylesheet">
+    {{if .NotesEnabled}}
+    <script>
+      var sections = {{.Sections}};
+      var titleNotes = {{.TitleNotes}}
+    </script>
+    <script src='/static/notes.js'></script>
+    {{end}}
+
+    <script>
+      // Initialize Google Analytics tracking code on production site only.
+      if (window["location"] && window["location"]["hostname"] == "talks.golang.org") {
+        var _gaq = _gaq || [];
+        _gaq.push(["_setAccount", "UA-11222381-6"]);
+        _gaq.push(["b._setAccount", "UA-49880327-6"]);
+        window.trackPageview = function() {
+          _gaq.push(["_trackPageview", location.pathname+location.hash]);
+          _gaq.push(["b._trackPageview", location.pathname+location.hash]);
+        };
+        window.trackPageview();
+        window.trackEvent = function(category, action, opt_label, opt_value, opt_noninteraction) {
+          _gaq.push(["_trackEvent", category, action, opt_label, opt_value, opt_noninteraction]);
+          _gaq.push(["b._trackEvent", category, action, opt_label, opt_value, opt_noninteraction]);
+        };
+      }
+    </script>
+  </head>
+
+  <body style='display: none'>
+
+    <section class='slides layout-widescreen'>
+
+      <article>
+        <h1>{{.Title}}</h1>
+        {{with .Subtitle}}<h3>{{.}}</h3>{{end}}
+        {{if not .Time.IsZero}}<h3>{{.Time.Format "2 January 2006"}}</h3>{{end}}
+        {{range .Authors}}
+          <div class="presenter">
+            {{range .TextElem}}{{elem $.Template .}}{{end}}
+          </div>
+        {{end}}
+      </article>
+
+  {{range $i, $s := .Sections}}
+  <!-- start of slide {{$s.Number}} -->
+      <article {{$s.HTMLAttributes}}>
+      {{if $s.Elem}}
+        <h3>{{$s.Title}}</h3>
+        {{range $s.Elem}}{{elem $.Template .}}{{end}}
+      {{else}}
+        <h2>{{$s.Title}}</h2>
+      {{end}}
+      <span class="pagenumber">{{pagenum $s 1}}</span>
+      </article>
+  <!-- end of slide {{$s.Number}} -->
+  {{end}}{{/* of Slide block */}}
+
+      <article>
+        <h3>Thank you</h3>
+        {{range .Authors}}
+          <div class="presenter">
+            {{range .Elem}}{{elem $.Template .}}{{end}}
+          </div>
+        {{end}}
+      </article>
+
+    </section>
+
+    <div id="help">
+      Use the left and right arrow keys or click the left and right
+      edges of the page to navigate between slides.<br>
+      (Press 'H' or navigate to hide this message.)
+    </div>
+
+    {{if .PlayEnabled}}
+    <script src='/play.js' data-manual></script>
+    <script>
+
+    </script>
+    {{end}}
+
+    <script>
+      (function() {
+        // Load Google Analytics tracking code on production site only.
+        if (window["location"] && window["location"]["hostname"] == "talks.golang.org") {
+          var ga = document.createElement("script"); ga.type = "text/javascript"; ga.async = true;
+          ga.src = ("https:" == document.location.protocol ? "https://ssl" : "http://www") + ".google-analytics.com/ga.js";
+          var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(ga, s);
+        }
+      })();
+    </script>
+
+    <script>
+  Prism.plugins.NormalizeWhitespace.setDefaults({
+    'remove-trailing': true,
+    'remove-indent': false,
+    'remove-initial-line-feed': true,
+    'left-trim': false,
+    'right-trim': true
+
+    /*'break-lines': 80,
+    'indent': 2,
+
+    'tabs-to-spaces': 4,
+    'spaces-to-tabs': 4*/
+  });
+    </script>
+
+ 
+    <script> 
+      var codeElem = document.querySelectorAll('div.noedit code pre');
+      var editableCodeElems = document.querySelectorAll('div.edit code pre[contenteditable="true"]');
+      var focusableEditElems = document.querySelectorAll('div.edit, div.edit code, div.edit pre');
+      
+      // render single element code. Formats element and renders Prism
+      function renderGo(el) {
+        el.innerHTML = el.innerHTML.replace(/[<]br[/]?[>]/gi,"\n"); // replace newline breaks with actual newline chars
+        Prism.highlightElement(el);
+      }
+      
+      // renders all editable elements.
+      // is separate from non editables to provide fast syntaxhighlighting on-the-fly
+      function renderEditables() {
+        document.querySelectorAll('div.edit code pre[contenteditable="true"]').forEach(renderGo);
+        // writing code creates new pre elements, gotta search for them all every time! what a bore!
+        // editableCodeElems.forEach(renderGo);
+      }
+      
+      // renders all code elements. Should only be called once upon window loading
+      function renderAll() {
+        renderEditables();
+        codeElem.forEach(renderGo)
+      }
+
+    // renders syntax highlighting on the fly using Ctrl key
+    function addRenderListener(el) {
+      el.addEventListener("keyup", event => {
+        var k = event.keyCode || event.which; // keycode
+        if (k == 17) {
+          renderEditables();
+        }
+      });
+    }
+    
+    focusableEditElems.forEach(addRenderListener) // adds event listener for on the fly highlighting
+    renderAll(); // renders all code
+
+    // insert tab in code context
+    $('div[contenteditable="true"]').on("keydown",function(event) {
+      var k = event.keyCode || event.which; // keycode
+      if (k == 9) {
+        event.preventDefault();
+        document.execCommand('insertHTML', false, '    ');
+      }
+    });
+
+    </script>
+  </body>
+</html>
+{{end}}
+
+{{define "newline"}}
+<br>
+
+{{end}}
diff --git a/presentations/2025-01-09--buidleu--manfred/Makefile b/presentations/2025-01-09--buidleu--manfred/Makefile
index 842599e..e3c861a 100644
--- a/presentations/2025-01-09--buidleu--manfred/Makefile
+++ b/presentations/2025-01-09--buidleu--manfred/Makefile
@@ -1,5 +1,6 @@
+runx:
+	cd ..; go run github.com/soypat/go-presentx -http 0.0.0.0:3999 -base ../.presentx
+
 run:
 	cd ..; go run golang.org/x/tools/cmd/present -http 0.0.0.0:3999 # -base ../..
 
-runx:
-	cd ..; go run github.com/soypat/go-presentx -http 0.0.0.0:3999