title: swift image for row action buttons
body: <p>In my swift 2 app, I have a table view and a row action button (delete),
  I found a way to change the background color of this button, but now I would like to set an image instead of the text "Delete"</p>
  
  <p>Is there an swift solution?
  here is my code:</p>
  
  <pre><code>func tableView(tableView: UITableView, editActionsForRowAtIndexPath indexPath: NSIndexPath) -&gt; [UITableViewRowAction]? {
      let delete = UITableViewRowAction(style: .Default, title: "Delete") { (action, indexPath) in
  
      // do some action
  
      delete.backgroundColor = UIColor.redColor()
      return [delete]
  }
  </code></pre>