Issue #5600: Fixed a bug about UISlider
Issue #5600: UILoadingBar
Issue #5600: Fixed a bug about UILabelAtlas
Issue #5600: Fixed a bug about Label line wrap
Issue #5600: correct some mistakes of ccui.Layout, ccui.ScrollView, ccui.ListView
Merge branch 'develop-cocostudio' of https://github.com/VisualSJ/cocos2d-html5 into Issue5600_Cocostudio