Issue #5600: sync ccui.ScrollView
Merge branch 'develop-cocostudio' of https://github.com/VisualSJ/cocos2d-html5 into Issue5600_Cocostudio
Issue #5600: Fixed a bug about UI position
Issue #5600: correct some mistakes of Cocos GUI
Merge branch 'Issue5600_Cocostudio' of http://github.com/dingpinglv/cocos2d-html5 into develop-cocostudio
Issue #5600: UICheckbox position error