Fixed #1615 Optimize performance for Matrix and draw of Sprite
Merge branch 'master' of https://github.com/cocos2d/cocos2d-html5 into iss1615_WebGLRendering
Fixed #1615 fixed a typo bug for WebGL toggle
Merge pull request #868 from dingpinglv/Iss1615_WebGLRendering

Fixed #1615 Optimize performance for Matrix and draw of Sprite