title: Rails and Sprockets require file from parent folder
body: <p>I'm using <code>Sprockets</code> and I want to add require from parent folder into my <code>application.js</code>, 
  So I've tried this : </p>
  
  <pre><code>//= require ../plugins/adminlte/plugins/datatables/dataTables.bootstrap
  </code></pre>
  
  <p>but it doesn't work I get </p>
  
  <blockquote>
    <p>Sprockets::FileNotFound</p>
  </blockquote>
  
  <p>this is the path of file I want to import :</p>
  
  <pre><code>-lib/assets/plugins/adminlte/plugins/dataTables.bootstrap.js 
  </code></pre>