title: API.AI middleware with Botkit Facebook no response
body: <p>I'm trying to add API.AI middleware to my Botkit on Facebook Messenger.</p>
  
  <p>However, it doesn't return anything from API.AI.</p>
  
  <p>Anyone had success implementing API.AI with Botkit?</p>
  
  <pre><code>controller.middleware.receive.use(apiai.receive);
  
  controller.hears(['apiai'],'message_received',apiai.hears,function(bot, message) {
      console.log('APIAI: ', message)
  });
  </code></pre>
  
  <p>P.S. Here's the API.AI middleware <a href="https://github.com/abeai/botkit-middleware-apiai" rel="nofollow noreferrer">https://github.com/abeai/botkit-middleware-apiai</a></p>