Issue #5941: adds LabelTTF to new renderer for WebGL
Merge branch 'Renderer' of https://github.com/cocos2d/cocos2d-html5 into Iss5941_WebGLRenderer
Merge pull request #2281 from dingpinglv/Iss5941_WebGLRenderer

Issue #5941: adds LabelTTF to new renderer for WebGL