Replaced KVO with blocks and moved to integrate banner feed.
Added a banners feed URL to the URLs header.
Began processing banners.
Basic non-crashing implementation of collection view delegate and data source.
Tweaks to the collection view controller.
Renamed some classes with a new class prefix.
Added banner model class.
Implemented some more collection view, removed the dealloc with KVO unregistration.
The data source can now handle ingesting banner data. Whoo!
Removed KVO unregistration.
Tweaks to the banner cell.