title: Store multiple user identities
body: <p>I implemented cookie authentication and google one. And I have this problem:
  assume I'm logged in with cookie identity and I want to link google account to ASP identity account. But when I successfully log in to google account I see that I was logged out from cookie identity because it was replaced by Google identity. And I can't link google account because now I'm out of ASP identity account. One possible solution is to store account data for example in TempData, and after google login perform ASP login and then link two accounts. But that's a trick.</p>
  
  <p>So the question is could I store both identities cookie and google? </p>