development: added UIWindow extension that allows for an application to capture the screen as a UIImage.

development: Fixed an issue where changing between pulse animations would eventually end up in a state where maskToBounds is false when it should be true.

PhotoLibrary integration from Apple's PHPhotoLibrary.

added additional delegation methods to PhotoLibrary that are executed after changes to the PhotoLibrary from an external source

added PhotoLibraryDataSource struct type for moving PhotoLibrary collections arount with their assets

updated initial PhotoLibrary codebase to include a caching instance as well as collection dictionary