Update to default gitignore file for Objective-C projects. Found at https://github.com/github/gitignore/blob/master/Objective-C.gitignore
Update to default gitignore file for Objective-C projects. Found at https://github.com/github/gitignore/blob/master/Objective-C.gitignore

ddoria921/DDCoachMarks,andygeers/DDCoachMarks