Updates to put the map in a sub-view of the main screen and rough in of the POIs

Pull request for a handful of commits that I've done over the past few days.

Embed the GMSMapView in a sub-view of the main screen, which should allow the storyboard work to run independent of the Map coding work that I still have to work on.

Transitioned away from my temporary stand-in database to Brandt's database.

Added the rough-in code for placing POIs.  This doesn't include custom icons (don't have them yet anyway), nor does it include the custom pop-up bubbles, which it turns out is going to be more work than I anticipated (to have clickable buttons in the pop-ups requires writing a bunch of custom handler code, and my first attempts don't seem to be working as anticipated.)

Also included in this batch of commits is the renaming of the ViewController class to MapViewController, since we're going to have to start adding UIViewController instances for the setting and filter screens, as well as the login screens, and those should be happening ASAP.