Merge pull request #1663 from pandamicro/develop-3.0

Issue #4294: Refactor ccui.UIHelper to ccui.helper
Issue #4277: add setSpriteFrame function to cc.Sprite
Issue #4277: update authors list
Merge pull request #1664 from dingpinglv/Iss4277_FixBugsForV3.0

Issue #4277: add setSpriteFrame function to cc.Sprite
issue #4221 ccui.UIHelper->ccui.uiHelper
Merge branch 'develop-3.0' of https://github.com/cocos2d/cocos2d-html5 into develop-3.0-new

Conflicts:
	extensions/ccui/layouts/UILayout.js
	extensions/ccui/system/UIHelper.js
	extensions/cocostudio/action/CCActionNode.js
issue #4221 Correct gui constant
Merge pull request #1665 from xingsenma/develop-3.0

issue #4221 ccui.UIHelper->ccui.uiHelper
issue #4277 : Refactor to reduce key words and fix some bugs.
Merge pull request #1666 from SmallAiTT/iss_4277_fix4release3.0

issue #4277 : Refactor to reduce key words and fix some bugs.
Feature #4010: Add retina enable function
Merge branch 'develop-3.0' of git://github.com/cocos2d/cocos2d-html5 into develop-3.0