Added *_before_changed event
Added *_before_changed event

ryanwilliams/cocos2d-javascript,fkiller/cocos2d-javascript,synaptek/cocos2d-javascript,ryanwilliams/cocos2d-javascript,synaptek/cocos2d-javascript,fkiller/cocos2d-javascript,fkiller/cocos2d-javascript,ryanwilliams/cocos2d-javascript,synaptek/cocos2d-javascript,ryanwilliams/cocos2d-javascript,synaptek/cocos2d-javascript,synaptek/cocos2d-javascript,ryanwilliams/cocos2d-javascript