Closed #5813: Refactor sprite's blendFunc to support more features on Canvas
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into Iss5813_BlendFunc
Merge pull request #2118 from dingpinglv/Iss5813_BlendFunc

Closed #5813: Refactor sprite's blendFunc to support more features on Canvas