[Cocos2d-JS] Add release note for 3.0 RC2
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
[Cocos2d-JS] Documents for Cocos2d-JS v3.0 RC2 release
[Cocos2d-JS] Fix chinese doc name issue
[Cocos2d-JS] Fix title
[Cocos2d-JS] Add additional notice
Merge pull request #430 from pandamicro/master

[Cocos2d-JS] v3.0 RC2 release docs