Merge pull request #12 from VisualSJ/Iss2416_RefactorRenderer

Iss2416 refactor renderer
Issue #2416: refactor Engine's renderer
Merge branch 'Iss2416_RefactorRenderer' of https://github.com/dingpinglv/cocos2d-html5 into Iss2416_RefactorRenderer
LabelBMFont renderCmd
Merge branch 'Iss2416_RefactorRenderer' of http://github.com/dingpinglv/cocos2d-html5 into Iss2416_RefactorRenderer