title: UITableViewRowAction title as image icon instead of text
body: <p>I want put the icon (image) instead of text in swipe actions in tableviewCell in Swift.</p>
  
  <p>But i dont how to put the image instead of title text?</p>
  
  <h2>My code is below:</h2>
  
  <pre><code>func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -&gt; [AnyObject]?  {
  
      var shareAction = UITableViewRowAction(style: UITableViewRowActionStyle.Default, title: "Share" , handler: { (action:UITableViewRowAction!, indexPath:NSIndexPath!) -&gt; Void in
          // 2
          let shareMenu = UIAlertController(title: nil, message: "Share using", preferredStyle: .ActionSheet)
  
          let twitterAction = UIAlertAction(title: "Twitter", style: UIAlertActionStyle.Default, handler: nil)
          let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil)
  
          shareMenu.addAction(twitterAction)
          shareMenu.addAction(cancelAction)
  
  
          self.presentViewController(shareMenu, animated: true, completion: nil)
      })
      // 3
      var rateAction =    (style: UITableViewRowActionStyle.Default, title: "rate",im , handler: { (action:UITableViewRowAction!, indexPath:NSIndexPath!) -&gt; Void in
          // 4
  
          let rateMenu = UIAlertController(title: nil, message: "Rate this App", preferredStyle: .ActionSheet)
  
          let appRateAction = UIAlertAction(title: "Rate", style: UIAlertActionStyle.Default, handler: nil)
          let cancelAction = UIAlertAction(title: "Cancel", style: UIAlertActionStyle.Cancel, handler: nil)
  
          rateMenu.addAction(appRateAction)
          rateMenu.addAction(cancelAction)
  
  
          self.presentViewController(rateMenu, animated: true, completion: nil)
      })
  
      // 5
      return [shareAction,rateAction]
  }
  </code></pre>
  
  <p>Can you someone pls help me on this?</p>
  
  <p>Thanks in advance</p>