Merge pull request #1966 from dingpinglv/Iss5671_SpriteSetColor

Closed #5671: Refactor cc.Sprite's setColor for Performance
Closed #5671: Refactor cc.Sprite's setColor for Performance(remove the test code)
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss5671_SpriteSetColor