Merge branch 'master' of https://github.com/cocos2d/cocos-docs
Merge branches 'master' and 'master' of https://github.com/cocos2d/cocos-docs
[Cocos2d-JS]v3.0a2 and v2.2.3 change log added
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
Merge pull request #234 from joshuastray/master

add doc for how to add extension to jsb
Merge branch 'master' of https://github.com/cocos2d/cocos-docs
[Cocos2d-JS]v3.0a2 and v2.2.3 upgrade guide added
[Cocos2d-JS]Add release notes
[Cocos2d-JS]Update 3.0a release note links
[Cocos2d-JS]Update release notes catalog
[Cocos2d-JS]Update 3.0a2 upgrade guide
[Cocos2d-JS]Update catalog
Merge pull request #235 from pandamicro/master

Update documents for Cocos2d-JS v3.0 alpha 2 release