TryIOS- InstaPhoto Changed Feed to UITableVC

The Feed now uses a UITableViewController rather than just a
UIViewController. It no longer links to the FavoritesVC since we have a
TabBarController at the bottom that lets the user switch between
Favorites and the Feed.
TryIOS- Level 5 InstaPhoto App

- Add several properties to our FeedVC for summarizing pictures in our
feed. (Note only the 1st cell will point to an actual picture - this
will be changed to pull data from API)
- Add new custom UIViewController PhotoVC used to zoom in on a picture
from the Feed.
- Adding utility method to help ensure that the content of our custom
UIViewControllers won’t show partially underneath the translucent
navigation bar.
TryIOS- No functional changes

Renaming classes to have shorter names with IPA prefix (InstaPhotoApp)