title: Automatic redirect after login with react-router
body: <p>I wanted to build a Facebook login into my <strong>react/react-router/flux</strong> application.
  I have a listener registered on the login event and would like to redirect the user to <code>'/dashboard'</code> if they are logged in. How can I do that? <code>location.push</code> didn't work very well, except after reloading the page completely.</p>