title: Errno 13 Permission denied in django-wkhtmltopdf
body: <p>I use django-wkhtmltopdf to generate PDF documents.
  I described a clear path to the django-wkhtmltopdf.</p>
  
  <pre><code>WKHTMLTOPDF_CMD = '/home/vagrant/envs/vagrant/lib/python2.7/site-packages/wkhtmltopdf'
  </code></pre>
  
  <p>I get the error:</p>
  
  <pre><code>[Errno 13] Permission denied
  </code></pre>
  
  <p>Permissions in the path to the django-wkhtmltopdf:</p>
  
  <pre><code>drwxrwxr-x 3 vagrant vagrant Feb 17, 4096 7:32 wkhtmltopdf
  </code></pre>