Merge pull request #1731 from pandamicro/develop-3.0

Fixed #4589: Make actions extendable directly via ctor complete
Fixed: sync cc.eventManager to -x and add some jsDoc to the classes of event-manager
Merge pull request #1732 from dingpinglv/Iss_SyncEventManager

Fixed: sync cc.eventManager to -x and add some jsDoc to the classes of event-manager
Fixed: use "if-else" replace "if"
Fixed: use "if-else" replace "switch" for better performance
Merge pull request #1733 from dingpinglv/Iss_SyncEventManager

Fixed: use "if-else" replace "switch" for better performance
Fixed #4638: Add loop parameter to cc.Animation's initWithSpriteFrames
Issue #4589: Make Animation extendable directly via ctor
Issue #4589: Make engine classes extendable directly via ctor pack 1
	ClippingNode
	AltasNode
	EventManager
	Labels
	Animation
	GLProgram
	DrawNode
	Armature
Merge branch 'develop-3.0' of git://github.com/cocos2d/cocos2d-html5 into develop-3.0