This app uses Alamofire to query the New York Times' best sellers list for fiction
Clicking a book title will send you to a detail page where the book cover image is loaded async using GCD and then sent back on the main thread
Once the completion closure is hit with the image, the image is sent forward to the detail page using Notification Center and the image is sent backwards to the first page using delegation.
Tap on image to launch SFSafariViewController from Safari framework. Browser takes you to the book's amazon link.
Tests are included for async methods