title: Rails : Adding an admin role using devise who can see all the users
body: <p>I need to create an admin role using devise for my app. I've created basic authentication using devise . I have a devise user model in my app but now i need an admin who can show edit and destroy all the users. I tried following the tutorials but none of them helped.
  I am using rails 3.0.10 and ruby 1.9.2-p290. </p>