Fixed #2560: fixed a bug of Armature that its position doesn't update in visit on WebGL mode
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss2560_ArmatureUpdateStatus
Merge pull request #2561 from dingpinglv/Iss2560_ArmatureUpdateStatus

Fixed #2560: fixed a bug of Armature that its position doesn't update in visit on WebGL mode