stacked-up example is not working after install

[fchirigati]

When running the runserver script:

 * Starting PostgreSQL 9.5 database server
Traceback (most recent call last):
  File "./manage.py", line 7, in <module>
    from django.core.management import execute_from_command_line
ImportError: No module named django.core.management
 * Stopping PostgreSQL 9.5 database server

This is caused by an error while installing the dependencies from stacked-up:

==> default: Collecting six==1.2.0 (from -r requirements.txt (line 12))
==> default:   Downloading six-1.2.0.tar.gz
==> default:     Complete output from command python setup.py egg_info:
==> default:     Traceback (most recent call last):
==> default:       File "<string>", line 1, in <module>
==> default:       File "/home/vagrant/.virtualenvs/stacked-up/local/lib/python2.7/site-packages/setuptools/__init__.py", line 160, in <module>
==> default:         monkey.patch_all()
==> default:       File "/home/vagrant/.virtualenvs/stacked-up/local/lib/python2.7/site-packages/setuptools/monkey.py", line 90, in patch_all
==> default:         patch_for_msvc_specialized_compiler()
==> default:       File "/home/vagrant/.virtualenvs/stacked-up/local/lib/python2.7/site-packages/setuptools/monkey.py", line 142, in patch_for_msvc_specialized_compiler
==> default:         msvc = import_module('setuptools.msvc')
==> default:       File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
==> default:         __import__(name)
==> default:       File "/home/vagrant/.virtualenvs/stacked-up/local/lib/python2.7/site-packages/setuptools/msvc.py", line 25, in <module>
==> default:         from six.moves import filterfalse
==> default:     ImportError: cannot import name filterfalse