Issue #2416: refactor LabelTTF's renderer
Merge branch 'Iss2416_RefactorRenderer' of https://github.com/dingpinglv/cocos2d-html5 into Iss2416_RefactorRenderer
Fixed Pause All audio without background music error
Merge pull request #2460 from VisualSJ/develop-audio

Fixed Pause All audio without background music error
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2416_RefactorRenderer
Issue #2416: Correct some mistakes for cc.LabelTTF