issue #4221 add richText
issue #4221 Refactor flipped
issue #4221 Refactor setBackGroundImageColor for Layout
issue #4221 add getCustomSize method for widget
issue #4221 Set default enabled touch for widget
issue #4221 Fixed some bug
Merge branch 'develop-3.0' of https://github.com/cocos2d/cocos2d-html5 into develop-3.0-new

Conflicts:
	extensions/ccui/base-classes/UIWidget.js
	extensions/ccui/layouts/UILayout.js
Merge pull request #1648 from xingsenma/develop-3.0

issue #4221 add richText