Issue #5941: add renderTexture to new renderer for WebGL
Merge branch 'Renderer' of https://github.com/cocos2d/cocos2d-html5 into Iss5941_WebGLRenderer
Issue #5941: Fixed a bug of cc.Sprite that its transform is incorrect when it flipped
Merge pull request #2285 from dingpinglv/Iss5941_WebGLRenderer

Issue #5941: Fixed a bug of cc.Sprite that its transform is incorrect when it flipped