fixed bug dispatchevet failure in chrome
Merge pull request #2475 from haozit146/fixbug-dispatchevent-failure-in-chrome

fixed bug dispatch event failure in chrome
Issue #2416: correct the mistake updating status in SpriteBatchNode
Issue #2416: update the dirty flag
Merge branch 'Iss2416_RefactorRenderer' of https://github.com/dingpinglv/cocos2d-html5 into Iss2416_RefactorRenderer
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2416_RefactorRenderer
Issue #2416: correct some mistakes of cc.SpriteBatchNode