Mapping generic classes like PINImage, PINImageView and PINButton to the equivalent UIKit or AppKit classes. Throughout the framework use these mappings instead of the concrete UIKit / AppKit names. Furthermore we provide a category on NSImage that is adding methods that are not available on NSImage but on UIImage.
Fixes the setUpdateWithProgress: method that currently calls itself instead of passing the value through to the prefixed pin_updateWithProgress property. This results into a infinite loop and a crash.
