title: How to navigate to directly to the initial route when using TabNavigator?
body: <p>I am using <code>TabNavigator</code> from <code>react-navigation</code>. It's working fine but I need to do a little trick. </p>
  
  <p>When I navigate between <code>StackNavigator</code> routes, after changing tabs I need my route go directly in the initial route. So I need the route state to be reset.</p>
  
  <pre><code>const HomeStack = StackNavigator({
    Main: { screen: HomeScreen },
    Profile: { screen: ProfileScreen },
  
  
  });
  
  const AboutStack = StackNavigator({
    Main: { screen: AboutScreen },
  });
  
  TabNavigator(
    {
      Home: { screen: HomeStack },
      About: { screen: AboutStack },
    }
  </code></pre>
  
  <p>Let's say I am in the <code>Main</code> route from the <code>Home</code> tab and then I have navigated to <code>Profile</code> before switching to the <code>About</code> tab. When I go back to the <code>Home</code> tab I want my app directly to navigate to the <code>Main</code> route and clear history. Just like a reset.</p>
  
  <p>Any suggestion ?</p>