title: before/after route method with Marionette AppRouter
body: <p>In Backbone Router there is a chance to use before/after methods to define what's going to happen before/after the route get fired.</p>
  
  <p>I'm using <a href="http://marionettejs.com/docs/v2.4.3/marionette.approuter.html" rel="nofollow">Marionette AppRouter</a> and I discover I cannot do the same with it.</p>
  
  <p>Do you know any way to reproduce the same behavior with AppRouter? I was thinking maybe there is a extension to do so.</p>
  
  <p>Thanks in advance!</p>