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
Issue #4589: Fix bugs
Issue #4589: Fix bug of argument test in MenuItems' constructors
Merge pull request #1736 from pandamicro/develop-3.0

Issue #4589: Make engine classes extendable directly via ctor pack 1