title: Rotate MapView using Compass orientation
body: <p>Is it possible to have an embedded <code>MKMapView</code> rotate to always face the direction the iPhone is facing?  Basically I want to mimic the Map app rotation feature on my own app.</p>
  
  <p>I see that the iPhone SDK does not expose the functionality.  However, I wonder if it would work to rotate the entire view using <code>CGAffineTransformMakeRotate</code>.  Would it affect tapping and zooming?  Is there a better way?</p>