title: Rails include javascripts assets folder recursively
body: <p>I understand how to add one javascript file to rails assets pipeline. Just add</p>
  
  <pre><code>//= require filename 
  </code></pre>
  
  <p>to application.js</p>
  
  <p>But how can I include many javscripts files under one folder </p>
  
  <pre><code>vendor/assets/javascripts/&lt;js_library&gt;
  </code></pre>
  
  <p>Or I have to list them all explicitly ?</p>