Fix warnings in BuddySDK for Xcode 6

* Mark crash reporting unused members as `__unused` (Because it is open source code, it's better than deleting them, IMO).
* Update BuddySDK to officially/only reference XCTest and remove deprecated OCUnit.
* Change deprecated `NSDateComponents` code to reference newer `dayOfWeek`.
* Update project settings and 3rd party depencies for BuddyStarter, PhotoGallery, RegisterLogin, and PushChat.