Issue #5941: adds WebGL renderer to H5
Merge branch 'Renderer' of https://github.com/cocos2d/cocos2d-html5 into Iss5941_WebGLRenderer

Conflicts:
	cocos2d/core/renderer/RendererCanvas.js
Merge pull request #2273 from dingpinglv/Iss5941_WebGLRenderer

Issue #5941: adds WebGL renderer to H5