title: Rails devise: user_signed_in? not working
body: <p>I have this in my view:</p>
  
  <pre><code>&lt;% if user_signed_in? %&gt;
  &lt;%= current_user.email %&gt;
  &lt;% else %&gt;
  &lt;%= link_to "Sign in", new_user_session_path %&gt;&lt;br /&gt;
  &lt;%= link_to "Opret", new_user_session_path %&gt;&lt;br /&gt;
  &lt;% end %&gt;
  </code></pre>
  
  <p>But when have signed in as a user: 
  I still get the links in view: </p>
  
  <pre><code>&lt;%= link_to "Sign in", new_user_session_path %&gt;&lt;br /&gt;
  &lt;%= link_to "Opret", new_user_session_path %&gt;&lt;br /&gt;
  </code></pre>
  
  <p>Why is the helper not working? </p>