Issue #5507: auto full screen bug
Merge pull request #1901 from VisualSJ/develop-zoom

Issue #5507: auto full screen bug
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss5096_Renderer
Issue #5096: fixed a bug of LabelTTF that it doesn't update string in visit function