title: How to know If the request came from Cache or not using AFNetworking
body: <p>This is my first day to me with AFNetworking, I like it :)
  I've only one question,</p>
  
  <p>I've a request and I cached the response, and set the caching policy,
  How I could know whether the response data is coming from the cache side or the data is loaded from the originating source ?</p>
  
  <p>I need something like </p>
  
  <pre><code>NSLog(@"Cach Used : %@", [request didUseCachedResponse] ? @"YES" : @"NO");
  </code></pre>
  
  <p>Thanks for your help :)</p>