Fixed: correct a bug of cc.SpriteBatchNode on Canvas mode that the order of its descendants is incorrect.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into setTransform
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into setTransform
Merge pull request #2551 from dingpinglv/setTransform

Fixed: correct a bug of cc.SpriteBatchNode on Canvas mode that the order of its descendants is incorrect.