IPHONEAPP-649

Add delegate methods for the AGSLocationDisplayDataSource and make sure the data source is properly configured when the user location tracking is enabled.

Signed-off-by: Blake Skinner <bskinner@mit.edu>
IPHONEAPP-649

Make sure to handle the case where there is no previous userLocation and [MITMapView showsUserLocation] is currently disabled

Signed-off-by: Blake Skinner <bskinner@mit.edu>
IPHONEAPP-649

Add implementations of the delegate methods for tracking user location

Signed-off-by: Blake Skinner <bskinner@mit.edu>
IPHONEAPP-649

Forgot to add the delegate interface to the list of implemented interfaces

Signed-off-by: Blake Skinner <bskinner@mit.edu>