This is an example project demonstrating how to draw a polyline inside an
MKMapView that continues to display correctly even as a user pinches and zooms
the map. It incorporates and expands upon ideas from Craig Spitzkoff and
Nicolas Neubauer.

For more information, see:

http://navarra.ca/?p=786

For information on the inspiration behind this original work, see:

http://spitzkoff.com/craig/?p=65
http://pixelfehler.nicolas-neubauer.de/2009/09/04/mapkit-google-maps-iphone-and-drawing-routes-or-polylines/