Change some public api to private.
Remove some public api.
Fix some bugs.
Merge branch 'develop-3.0' of https://github.com/cocos2d/cocos2d-html5 into CCGame_dev3.0
Merge pull request #1625 from SmallAiTT/CCGame_dev3.0

Change some public api to private.  Remove some public api. Fix some bugs.