Merge pull request #1723 from pandamicro/develop-3.0

Issue #4580: Fix typo in ccui.Widget.TOUCH_BEGAN
Issue #4580: Make Texture2d constants values equals to Cocos2d-x
Fixed : sync cc.eventManager
Merge pull request #1725 from dingpinglv/Iss_SyncEventManager

Fixed : sync cc.eventManager
Closed #4597: set doLayout function of ccui to private function
Merge branch 'develop-3.0' of https://github.com/cocos2d/cocos2d-html5 into Iss_SyncEventManager
Merge pull request #1726 from dingpinglv/Iss_SyncEventManager

Closed #4597: set doLayout function of ccui to private function
Issue #4589: Make actions extendable directly via ctor pack 1
Merge branch 'develop-3.0' of git://github.com/cocos2d/cocos2d-html5 into develop-3.0