Issue #4975: integrate spine into -html5 v2.2.3
Merge branch 'v2.x' of https://github.com/cocos2d/cocos2d-html5 into Iss4975_Spine
Merge pull request #1826 from dingpinglv/Iss4975_Spine

Issue #4975: integrate spine into -html5 v2.2.3