title: django allauth- connecting a user with Fb when a previous user hasn't logged out
body: <p>Im using django-allauth for facebook connect (with js_sdk). It works fine for a user. Now consider the following scenario:
  1. User A is logged in through Fb
  2. User B logs user A out of Fb on the machine and logs himself in.
  3. User B then tries to login with fb on my website (user A didnt log out)</p>
  
  <p>This either gives a fb dialog error that "user A has logged out" or it takes me to /accounts/facebook/login/token (in case of existing user) and /accounts/social/connections saying that "you can log in through any of the third party accounts -> User A or User B (in case of a new user)</p>
  
  <p>How do I deal with this scenario, I want that user B should seamlessly log in through fb (even if user A didn't log out).</p>