Dev environment : closure compiler + jshint update

Fixed error raised by closure compiler
Added es3 option to jshint (detect trailing commas)
Added curly option to jshint (missing curly braces for if/for blocks)
Removed trailing whitespaces (not enforced through jshint though)

js/utils/Template.js

@@ -23,7 +23,7 @@
           var value = dict[key];
           template = template.replace(new RegExp('\\{\\{'+key+'\\}\\}', 'g'), value);
         }
-      } 
+      }
       return template;
     }
   };