Merge pull request #509 from cocojoe/develop-v3

OpenAL added to CCAppDelegate
Fix install.sh download condition.
Removing the xccheckout file from the repo
Updating AUTHORS
Merge pull request #510 from cocojoe/develop-v3

CCColor Documentation
Merge branch 'develop-v3' of github:cocos2d/cocos2d-iphone into develop-v3