Fixed #2542: fixed a bug of ccui.RichText that its setContentSize is invalid.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into setTransform
Merge pull request #2544 from dingpinglv/setTransform

Fixed #2542: fixed a bug of ccui.RichText that its setContentSize is invalid.