Whitespace
Hid points of interest to keep route map clean
Removed debug output
Fixed reuseIdentifier bug

Was accidentally using the same identifier for station and train views,
occasionally causing a station view to be reused for trains.
Renamed train annotation classes

They're not really Green Line specific, per se, so taking that out of
the name (even though they need some beefing up to fully apply to other
lines).
Reorganized MapController slightly

Mainly, moved the MKMapViewDelegate-conforming methods into a class
extension, following Ray Wenderlich style guidelines and probably
Apple usage as well.
Set train annotations directly from train status

Better encapsulation. Also added toBeRemoved flag.
Track individual train pos'n and animate updates