title: How to replace/reset Relay.Environment for RNRF Router
body: <p>When user logs out of the app I want to reset <code>Relay.Environment</code> (replace existing one with a new one). 
  I've tried passing the new <code>Relay.Environment</code> to <code>Router</code>, when re-rendering the component, 
  <code>&lt;Router wrapBy={createRenderer()} sceneStyle={styles.scene}&gt;
       &lt;Scene key="root" tabs tabBarStyle={{ backgroundColor: '#333333' }}&gt;
  </code>
  <code>createRenderer()</code> returns current `Relay.Environment</p>
  
  <p>but I still see that scenes created with old <code>Relay.Environment</code>.
  Is there a correct way to do this? Am I missing something.</p>
  
  <p>Alex</p>