title: How to add custom action to the rails_admin
body: <p>In my case I need to approve records from the <a href="https://github.com/sferik/rails_admin" rel="nofollow">rails_admin</a> list panel. What I would like to do is to make a link with :remote => true for each record in the list page and using the pointed in the link action approve selected record.</p>
  
  <p>How to do this easily without hacking rails_admin?</p>