Add initial data model
Create NSManagedObject subclasses for data models and categories of them to create objects
Reorganize files and add Core Data Table View Controller
Add Core Data in Featured view controller
Clean up Featured view controller
Add PhotosByTag view controller
Change segue names
Add SPTPhotosTable view controller to improve MVC pattern
Start cleaning up code
Improve image cache
Improve documentation
Improve setup of fetchedResultsController
Clean up code
Improve Helpers documentation
Delete unused models
Improve documentation