title: Making an iAD delegate
body: <p>I want to add </p>
  
  <pre><code>- (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error 
  </code></pre>
  
  <p>but it won't let me, I can't figure out what to put HERE, to make it an iAD Delegate:</p>
  
  <pre><code>@interface MyAppDelegate : UIResponder &lt;UIApplicationDelegate, HERE&gt;
  </code></pre>