Fixed a bug of Armature reader that its isTween is incorrect.
Merge branch 'develop' of git://github.com/cocos2d/cocos2d-html5 into Iss5811_ArmatureShader
Merge pull request #2134 from dingpinglv/Iss5811_ArmatureShader

Fixed a bug of Armature reader that its isTween is incorrect.