title: Dynamic DrawerNavigator based on Login State React Native
body: <p>I need a DrawerNavigator that shows different options if the user is logged in or logged out, which is illustrated below: </p>
  
  <h1>not logged in</h1>
  
  <pre><code>--------------------
  | sign up / log in |
  |------------------|
  | info             |
  --------------------
  </code></pre>
  
  <h1>logged in</h1>
  
  <pre><code>--------------------
  | My Account       |
  |------------------|
  | Some Actions     |
  |------------------|
  | Info             |
  |------------------|
  | Log Out          |
  --------------------
  </code></pre>
  
  <p>I have no problem setting up a DrawerNavigator, which I use NavigationActions and Redux. However problem arises when I'm trying to display different DrawerNavigation - where should I check for the login status from Redux? </p>