Display search results in FindFriendsViewController
Populate FindFriendsViewController with search results.
Flesh out FriendsViewController a bit.

Adding Friend and FriendCell, implement checkmark toggling.
Use const NSString for CellIdentifier.
Reorganize imports.

I generally prefer:

* ThisFile.h
* Framework/Pod headers
* Project headers
* Categories

Not that it really matters…
Add a burger menu button for the FriendsViewController.
Error logging, and consistent debug logging.
Don't save photos to the assets library (camera roll).
Development cleanup.

* Don't try to upload images yet, we're not there.
* Declare significant methods in private category.
Ability to add friends.

* Client implementation for add friend endpoint
* UI for kicking off the api request.
Making Credentials mutable.
Move authentication to it's own View Controller.

I was admittedly trying some fanciness by putting the LoginView and
RegistrationView in the CameraViewController and showing them both
with a translucent background (so you'd see the camera output behind it).
This proved to be visually harmful and made the CameraViewController
carry more burden than it should have.  So, now it's gone and auth
has it's own view controller.

A side effect of this change is that the AuthenticationViewController 
needs to update the HAL Resource carried by the CameraViewController 
before it is dismissed.  I'm not wild about how this is currently done,
but it works.