Added making new empty graphs.

Author: Jabbath

package.json

@@ -1,6 +1,6 @@
 {
     "name": "graph-creator",
-    "version": "0.7.8",
+    "version": "0.8.8",
     "main": "index.html",
     "window": {
         "height": 1024,

src/cytoInit.js

@@ -37,8 +37,10 @@ function renderGraph(img){
 
     });
 
-    //Set our background image
-    $('#container').css('background-image', 'url(' + img.src + ')');    
+    //Set our background image if it's provided
+    if(img != null){
+        $('#container').css('background-image', 'url(' + img.src + ')');    
+    }
 
     //Bind our event handlers
     cy.on('tap', 'edge', removeEdge);

src/menu.js

@@ -2,6 +2,12 @@
 var menu = new nw.Menu({type: 'menubar'});
 
 var fileSubmenu = new nw.Menu();
+
+fileSubmenu.append(new nw.MenuItem({
+    label: 'New',
+    click: renderGraph
+}));
+
 fileSubmenu.append(new nw.MenuItem({
     label: 'Load Background',
     click: openImage