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/service/HistoryService.js

@@ -1,11 +1,11 @@
 (function () {
   var ns = $.namespace("pskl.service");
   ns.HistoryService = function (piskelController) {
-    this.piskelController = piskelController; 
+    this.piskelController = piskelController;
   };
 
   ns.HistoryService.prototype.init = function () {
-    
+
     $.subscribe(Events.TOOL_RELEASED, this.saveState.bind(this));
     $.subscribe(Events.UNDO, this.undo.bind(this));
     $.subscribe(Events.REDO, this.redo.bind(this));

js/service/ImageUploadService.js

@@ -5,14 +5,14 @@
   };
 
   ns.ImageUploadService.prototype.init = function () {
-    // service interface 
+    // service interface
   };
 
   /**
    * Upload a base64 image data to distant service. If successful, will call provided callback with the image URL as first argument;
    * @param {String} imageData base64 image data (such as the return value of canvas.toDataUrl())
    * @param {Function} cbSuccess success callback. 1st argument will be the uploaded image URL
-   * @param {Function} cbError error callback 
+   * @param {Function} cbError error callback
    */
   ns.ImageUploadService.prototype.upload = function (imageData, cbSuccess, cbError) {
     var xhr = new XMLHttpRequest();
@@ -21,7 +21,7 @@
     xhr.open('POST', this.serviceUrl_, true);
     xhr.onload = function (e) {
       if (this.status == 200) {
-        var imageUrl = "http://screenletstore.appspot.com/img/" + this.responseText; 
+        var imageUrl = "http://screenletstore.appspot.com/img/" + this.responseText;
         cbSuccess(imageUrl);
       } else {
         cbError();
@@ -30,5 +30,5 @@
 
     xhr.send(formData);
   };
-  
+
 })();