title: delete files in documents folder when iphone app terminated
body: <p>My iPhone app will download several content to Documents folder while running the application.  I want to delete the downloaded files when app is going to terminate. My app runs on target 4.3 or more and ARC enabled. What is the best place to delete content from documents folder ?</p>
  
  <pre><code>- (void)applicationWillTerminate:(UIApplication *)application
  </code></pre>
  
  <p>is not being called when the app is terminated.</p>