Django-plainpasswordhasher

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Enhance development environment.

- Feature 3 - Development environment now uses Tox (was using zc.buildout).
Tox runs the tests. TravisCI.org runs Tox.

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- Fixed "'package' must be a string" error when installing project.

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- Fixed upload on PyPI.

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- Imported PlainPasswordHasher implementation by Boris Feld.


.. rubric:: Notes & references

.. target-notes::

.. _`milestones`: https://github.com/novapost/django-plainpasswordhasher/issues/milestones