Convenience UITableView and UICollectionView data sources.

• TGRArrayDataSource and TGRFetchedResultsDataSource are reusable classes that implement UITableView and UICollectionView data sources using NSArray and NSFetchedResultsController respectively. Inspired by Lighter View Controllers.
• TGRFetchedResultsTableViewController is a reusable UITableViewController subclass that processes NSFetchedResultsController content changes the right way (based on code seen here).

Guillermo Gonzalez
@gonzalezreal

ReadingList is available under the MIT license. See LICENSE.md.