Update html5 ref
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
Issue #5780: Add -ObjC link flag to avoid Facebook plugin link issue
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
Update html5 engine
Merge pull request #637 from pandamicro/master

Issue #5780: Add -ObjC link flag to avoid Facebook plugin link issue