Update IntroScene.m

typo mistake.
Update Chipmunk reference.
Scheduler fixes and more unit tests.
Removing some debugging code.
Re-adding the CCScene.isScene method.
Overriding scale property now works for actions.
Overriding rotation property now works for actions.
Merge branch 'develop-v3' of github:cocos2d/cocos2d-iphone into develop-v3
Merge pull request #456 from wangsheng/develop-v3

Update IntroScene.m
Merge branch 'develop-v3' of github:cocos2d/cocos2d-iphone into develop-v3
Adding CCDirector.fixedUpdateInterval property.
Disabling the iOS 7 status bar by default.
Fixed typo and some method names in unit tests.
CCSetupHideDebugStats -> CCSetupShowDebugStats. Default is now not to show it which makes a bit more sense.
Proposed changes to the templates and default CCFileUtils behavior.
Fix CCB Reader crash on reading unaligned float*
Adds CCTextField to the UI headers
Merge branch 'develop-v3' of https://github.com/cocos2d/cocos2d-iphone into develop-v3
CCActionRemove added, will remove target from parent node and cleanup.
Fixes alignment issue when loading floats from ccb-file