title: Composer, PSR-4 Autoloading Iteration
body: <p>I am currently running Slim and Twig, my folder structure is as follow</p>
  
  <pre><code>/application/modules
  </code></pre>
  
  <p>In my composer.json I have</p>
  
  <pre><code>"autoload": {
      "psr-4": {
          "Application\\":        "application/modules/",
          "Core\\":               "application/",
          "Middleware\\":         "application/slim/middleware/"
      }
  }
  </code></pre>
  
  <p>My issue is is that in <code>Application\modules\</code> I have a directory for each module. Now my question is, is it possible to make composer iterate through the sub directories when using PSR-4 autoload?</p>