Closed #2786: Refactor cc.PhysicsSprite for Performance
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2786_RefactorPhysicsSprite
Merge pull request #1117 from dingpinglv/Iss2786_RefactorPhysicsSprite

Closed #2786: Refactor cc.PhysicsSprite for Performance