fixed a typo
Merge pull request #211 from dingpinglv/Iss_ReleaseNote

fixed a typo in cc.loader
Base concept of Cocos2d-x 3.0
fix the name of the directory
Transitions of scenes in Cocos2d-x 3.0
Merge branch 'master' of https://github.com/cocos2d/cocos-docs