title: Laravel 5 register middleware from in package service provider
body: <p>I'm currently developing a package in/for Laravel 5.<br>
  My package contains a custom middleware and I would like to add it to the <code>$routeMiddleware</code>array of the Kernel class from in my package Service Provider.<br>
  But I can't seem to find a way to do this.</p>
  
  <p>I tried to make a custom class that extends the Kernel class and then I can merge the array with my array.<br>
  But once out of the constructor it's not possible.</p>
  
  <p>In L4 you had App::middleware, but that function is no longer available in L5.</p>
  
  <p>Can anyone who has solved this problem help me solving this?</p>
  
  <p>Please, tell me if my question is not clear enough, so that I can clarerify it a bit.</p>