Creates sample app for MapKit demonstration

It's called RouteMaster. Like the bus.
Provides a simple UI. Just a map at the moment.
Now calculates a route and plots it on the map

Just between current location and the White House. Going to create a
well-known route with a smaller number of steps so we can look at those
instead.
Fills out the RouteMaster app with additional views for route details

Simple story-boarded app which can demonstrate the steps returned from
the route lookup.

This is untested since planes don't have internet.
Fixes some auto-layout constraints
Write up of the MapKit directions post

Need to pop some images in once I can create them.
Few fixes to the demo app

It now works as expected. Magic.
Adds pictures to the writeup
Updates license header at the top of the source files
Merge branch 'days/13-mapkit-directions'