title: How do I get the current user's access token in AngularFire2?
body: <p>In AngularFire you were able to access the providers (e.g Google) accessToken for the authenticated user.</p>
  
  <p>There does not seem to be a way to access this with AngularFire2?</p>
  
  <p>On initial login say like this: </p>
  
  <pre><code>this.af.auth.subscribe(user=&gt; {
    if (user) {
      console.log(user.google);
    }
  });
  </code></pre>
  
  <p>It will log out the idToken, accessToken, provider,
  But (on a page refresh) subsequently will log out the standard details (uid, displayName etc....)
  And the accessToken is not an accessible property?</p>
  
  <p>Is there a way to access the current users accessToken?</p>