Merge branch 'master' of git://github.com/cocos2d/cocos2d-x
fixed UI animation stop cause crash
Merge branch 'master' of git://github.com/cocos2d/cocos2d-x
replace nullptr to NULL
Merge branch 'master' of git://github.com/cocos2d/cocos2d-x
Merge pull request #4320 from liamcindy/master

[ci skip]fixed ui anmation crash when stop animation for master
[AUTO] : updating submodule reference to latest autogenerated bindings
Merge pull request #4334 from CocosRobot/updategeneratedsubmodule_1384839802

[ci skip][AUTO] : updating submodule reference to latest autogenerated bindings
Add doxygen comments for the CocoStudio
Merge pull request #4339 from samuele3hu/master

[ci skip]Add doxygen comments for the CocoStudio