title: integrate an external app in django taking the code from any folder
body: <p>I want to install the external app <a href="http://django-disqus.readthedocs.org/en/latest/installation.html" rel="nofollow">django-disqus</a> in my blog. However, instead of install the module in the system via pip install or python setup.py install, I would like to download the code to a specific folder called libs and then link it to my project. </p>
  
  <p>My folder structure is like this:</p>
  
  <pre><code>-root_folder
      -- project (here I have settings.py, urls.py and wsgi.py)
      -- blog (here I have models.py, admin.py, urls.py, templatetags/, template/)
      -- libs (here I want to add the code of disqus)
  </code></pre>
  
  <p>If I downloaded the code in libs, how can I link it to INSTALLED_APPS in setting.py?</p>
  
  <p>Note: I run django 1.8</p>