title: How do you make the sender display name appear with JSQMessageViewController?
body: <p>I have the following function that gets called for adding a message: </p>
  
  <pre><code>    func addMessage(text: String, displayName: String) {
          let message = JSQMessage(senderId: "tester", displayName: displayName, text: text)
          messages.append(message)
  
          finishReceivingMessage()
  
  }
  </code></pre>
  
  <p>Then in this function </p>
  
  <pre><code>    override func collectionView(collectionView: JSQMessagesCollectionView!,
      messageDataForItemAtIndexPath indexPath: NSIndexPath!) -&gt; JSQMessageData! {
          return messages[indexPath.item]
  }
  </code></pre>
  
  <p>I return the message date for that indexPath. The message appears correctly but there is no display name. </p>