Exercises
1. The sample app demonstrates how to transition from one layout to another with the Custom Flow menu option. Create a new layout that will display an image that fills the full width of the screen, and scrolls horizontally. Set the pinch-in gesture to display the new layout. Hint: Use a UICollectionViewFlowLayout subclass to implement the new layout, and be sure to adjust the logic in the collection view data source to display the full-screen-size image instead of the thumbnail.
2. Implement a method to add and delete items from the collection view (but not the actual asset library). Add support for insert and delete animations.
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