Enable livereload for watch:<theme> commands

Author: michielgerritsen

dev/tools/grunt/configs/watch.js

@@ -13,6 +13,9 @@ var themeOptions = {};
 
 _.each(themes, function(theme, name) {
     themeOptions[name] = {
+        'options': {
+            livereload: true
+        },
         'files': [
             '<%= combo.autopath(\''+name+'\', path.pub) %>/**/*.less'
         ],