title: Verify email address
body: <p>I have followed the RoR tutorial by Michael Hartl, for modeling users, sign in, and sign up.
  Now I'm in a position where I need to verify that whatever email is given upon login is a real email and not some random string that matches the regex I have on validation.</p>
  
  <p>I know Devise handles that. And I don't want to change the working code I have. How could I use ONLY the email verification feature that Devise has ? (don't want it to do any sign-in, and sessions, and authentication etc for me)</p>
  
  <p>If it's not possible to use Devise this way, how devastating would it be to plug Devise to my Rails user model ? </p>
  
  <p>Thanks ! </p>