title: Logout users with custom devise gem in rails3
body: <p>In admin section, I'm showing a list of currently logged in users. Now admin can select one or more user/users and destroy their session(logout them).Please help me ,i stuck here last 2 week. i also tried this approach</p>
  
  <pre><code> def sign_out_user
        @selected_user = params[:user_ids]
         for ur in @selected_user
        usr= User.find(ur)
        sign_out usr  
       end
      redirect_to "/users/login_history"
  end
  </code></pre>