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)

Gruntfile.js

@@ -36,6 +36,8 @@ module.exports = function(grunt) {
         undef : true,
         latedef : true,
         browser : true,
+        curly : true,
+        es3 : true,
         globals : {'$':true, 'jQuery' : true, 'pskl':true, 'Events':true, 'Constants':true, 'console' : true, 'module':true, 'require':true}
       },
       files: [
@@ -61,17 +63,17 @@ module.exports = function(grunt) {
       }
     },
     ghost : {
-      default : getGhostConfig(3000),
+      'default' : getGhostConfig(3000),
       local : getGhostConfig(50)
     },
     concat : {
       options : {
-        separator : ';',
+        separator : ';'
       },
       dist : {
         src : piskelScripts,
-        dest : 'build/piskel-packaged.js',
-      },
+        dest : 'build/piskel-packaged.js'
+      }
     },
     uglify : {
       options : {

js/controller/settings/GifExportController.js

@@ -53,7 +53,7 @@
       [1],
       [5],
       [10,true], //default
-      [20],
+      [20]
     ];
 
     for (var i = 0 ; i < dpis.length ; i++) {

js/drawingtools/BaseTool.js

@@ -56,7 +56,10 @@
       // Do what you need to for this
       pixels.push({"col": x0, "row": y0});
 
-      if ((x0==x1) && (y0==y1)) break;
+      if ((x0==x1) && (y0==y1)) {
+        break;
+      }
+
       var e2 = 2*err;
       if (e2>-dy){
         err -= dy;

js/utils/core.js

@@ -34,8 +34,10 @@ if (typeof Function.prototype.bind !== "function") {
   var ns = $.namespace("pskl.utils");
 
   ns.rgbToHex = function(r, g, b) {
-    if (r > 255 || g > 255 || b > 255)
+    if (r > 255 || g > 255 || b > 255) {
       throw "Invalid color component";
+    }
+    
     return ((r << 16) | (g << 8) | b).toString(16);
   };