title: openURL: with a NSURL containing a formatted NSString isn't working
body: <p>To open Google Maps with directions, i'm using a formatted NSString inside a NSURL. But it doesn't work with [[UIApplication sharedApplication] openURL:nsurl];</p>
  
  <p>code:</p>
  
  <pre><code>NSString * directionsURL = [NSString stringWithFormat:@"http://maps.google.com/maps?daddr=%@&amp;saddr=%@", @"Hartenseweg 16, Renkum", @"1 Infinte Loop, Cupertino"];
      [[UIApplication sharedApplication] openURL:[NSURL URLWithString:directionsURL]];
  </code></pre>