title: Automatic post-registration user authentication
body: <p>We're building a business app from the ground up in Symfony 2, and I've run into a bit of a snag with the user registration flow: after the user creates an account, they should be automatically logged in with those credentials, instead of being immediately forced to provide their credentials again.</p>
  
  <p>Anyone had any experience with this, or able to point me in the right direction?</p>