Closed #4051: cc.TMXLayer.removeChild's bug has been fixed.
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-html5 into Iss4051_FixTMXLayerRemoveChild
Merge pull request #1563 from dingpinglv/Iss4051_FixTMXLayerRemoveChild

Closed #4051: cc.TMXLayer.removeChild's bug has been fixed.