Improve read me
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
Update Cocos2d-x
Merge pull request #294 from pandamicro/master

Improve read me
Update the reference of submodule cocos2d-console.
Merge pull request #295 from natural-law/master

Update the reference of submodule cocos2d-console.
Improve Changelog and cocos console message
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
Improve windows message in cocos console
Merge pull request #296 from pandamicro/master

Improve Changelog and cocos console message
Update docs
Add a document link to upgrade guide
Merge pull request #297 from pandamicro/master

Update docs
Update link in release note
Merge pull request #298 from pandamicro/master

Update link in release note
Update release note
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js
Merge pull request #299 from pandamicro/master

Update release note
Update submodules
Merge branch 'master' of https://github.com/cocos2d/cocos2d-js