Issue #2416: refactor cc.RenderTexture
Merge branch 'Iss2416_RefactorRenderer' of https://github.com/dingpinglv/cocos2d-html5 into Iss2416_RefactorRenderer
Merge pull request #19 from VisualSJ/Iss2416_RefactorRenderer

Fixed a bug that atlasNode change [color | opacity] error
Issue #2416: correct some mistakes of cc.RenderTexture and cc.Layer
Merge branch 'Iss2416_RefactorRenderer' of https://github.com/dingpinglv/cocos2d-html5 into Iss2416_RefactorRenderer
Issue #2416: correct some mistakes of cc.ProgressTimer on WebGL
Merge pull request #20 from VisualSJ/Iss2416_RefactorRenderer

Issue #2416: Fixed LabelBMFont
Merge branch 'Iss2416_RefactorRenderer' of https://github.com/dingpinglv/cocos2d-html5 into Iss2416_RefactorRenderer
Merge pull request #21 from VisualSJ/Iss2416_RefactorRenderer

Issue #2416: Function is undefined of LabelTTF
Issue #2416: PhysicsSprite CanvasRender