Completed: Brock Boland

In order to implement this, I made a couple of changes to the starting code provided:

- Created a parent class for the two view controllers, to define a `backgroundImage` method
- Created a navigation controller subclass, to display the UIImageView behind its contents

The BackgroundNavigationViewController makes use of a custom transition, to get around the shadowy right border shown on the view controller that comes in during the default push transition (which looks funky scrolling over the background image).

I declined to add a three-letter prefix on the file names, to follow the standard set by the provided code, but normally do so in accordance with Apple's recommendations.

I'll be emailing Jeffrey shortly.