title: In App Purchase not working on Xcode 5, iOS 7 simulator
body: <p>It appears that In App Purchase on the simulator has again been broken.  We are able to successfully submit an SKProduct, but we NEVER get the appropriate callback.</p>
  
  <p>Any insight from others would be great...</p>
  
  <pre><code>[[SKPaymentQueue defaultQueue] addTransactionObserver:self];
  [[SKPaymentQueue defaultQueue] addPayment:skPayment];
  </code></pre>
  
  <p>No response from the observer delegate callback.</p>