title: How to apply before_filter to every action of every controller in Rails 3.2.11?
body: <p>I'd like to verify if the user is logged in on every single request to the server.</p>
  
  <p>Something like: </p>
  
  <pre><code>:before_filter verify_logged_in
  </code></pre>
  
  <p>Where should I put that before_filter so it applies to all controller actions and all requests?</p>