title: Using Devise before_action :authenticate_user! doesn't do anything
body: <p>I am trying to require login on all pages on my Rails 4 web site.
  In the ApplicationController I have added <code>before_action :authenticate_user!</code>, but it simply doesn't do anything. I have tried to add the same <code>before_action :authenticate_user!</code> to another controller, and it works fine.</p>
  
  <p>Do I need to do something else to the ApplicationController, to make the login be required on all actions (Except signup/signin)?</p>