title: LogOut button creates back button
body: <p>I created a button in my <code>UITableViewController</code> as a Left Bar Button Item to log the current user out and segue and to the login <code>ViewController</code>.</p>
  
  <p>The problem is that tapping it creates a back button on the login <code>ViewController</code> and user can come back to the previous view.</p>
  
  <p><img src="https://i.stack.imgur.com/LfMlk.png" alt=""></p>