title: Where are 'package data' files?
body: <p>I've created package with distutils including package data.
  When i look in tar.gz of my package I see expected files, BUT after package installation (by pip or by 'python setup.py install') there is no any package data. Only python scripts included. My <code>setup.py</code> is:</p>
  
  <pre><code># py3.3
  #from packaging.core import setup
  # py3.2
  from distutils.core import setup
  
  setup(
      name = 'mypkg',
      version = '0.7dev',
      author = 'Projekt Alef',
      author_email = 'tymoteusz.jankowski@gmail.com',
      packages = [
          'my_pkg',
          'my_pkg/tests',
          'my_pkg/plugins',
      ],
      #scritps=['bin/setup.sh',],
  )
  </code></pre>