Small improvements

Author: pandamicro

Diff for: cocos2d/core/base-nodes/CCNodeCanvasRenderCmd.js

@@ -283,7 +283,7 @@ cc.Node.RenderCmd.prototype = {
         }
 
         if (node._additionalTransformDirty) {
-            this._transform = cc.affineTransformConcat(t, node._additionalTransform);
+            cc.affineTransformConcatIn(t, node._additionalTransform);
         }
 
         if (this._updateCurrentRegions) {

Diff for: cocos2d/core/platform/CCConfig.js

@@ -267,7 +267,7 @@ cc.DRAWNODE_TOTAL_VERTICES = 20000;
  * @constant
  * @type {Number}
  */
-cc.IS_RETINA_DISPLAY_SUPPORTED = 1;
+cc.IS_RETINA_DISPLAY_SUPPORTED = 0;
 
 /**
  * Default engine

Diff for: cocos2d/core/platform/CCMacro.js

@@ -245,7 +245,7 @@ cc.FLT_EPSILON = 0.0000001192092896;
  * @function
  */
 cc.contentScaleFactor = cc.IS_RETINA_DISPLAY_SUPPORTED ? function () {
-    return cc.director.getContentScaleFactor();
+    return cc.director._contentScaleFactor;
 } : function () {
     return 1;
 };