Adds override keyword for override functions.
Merge pull request #4874 from dumganhar/develop

Adds override keyword for override functions.
[AUTO] : updating submodule reference to latest autogenerated bindings
Merge pull request #4875 from CocosRobot/updategeneratedsubmodule_1388830744

[AUTO] : updating submodule reference to latest autogenerated bindings
Merge branch 'develop' of https://github.com/cocos2d/cocos2d-x into developNewUI