title: Make nested route inside AuthenticatedRouteMixin accessible
body: <p>I'd like to "free" one nested route, so that also users who are not even logged in can access this route.</p>
  
  <p><strong>For example:</strong></p>
  
  <p><code>posts
  - /create
  - /edit
  - /show</code></p>
  
  <p>On the <code>posts</code> route I used the <code>AuthenticatedRouteMixin</code>.
  With this, all sub routes are automatically protected. Now I only want to make <code>/show</code> accessable. I know that I could use a mixin on <code>/create</code> and <code>/edit</code> and remove it from <code>posts</code> route, but if you have 10+ nested routes and only 1 of them should be available also for not logged in users, it's kind of inconvenient.</p>
  
  <p>Do you know any other solution to that challenge?</p>
  
  <p>If not, I think I have to write an additional mixin for that...</p>
  
  <p>Thanks!</p>