Fixed #2852: Corrected a RenderTexture's mistake for multiple resolution
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2852_RefactorMultResources
Merge pull request #1185 from dingpinglv/Iss2852_RefactorMultResources

Fixed #2852: Corrected a RenderTexture's mistake for multiple resolution