Django-locking

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* improve the test coverage with web client tests
* i18n: Dutch translation
* manual overrides by admins (in the UI)
* enhance the warning dialog users see five minutes prior to expiry, to allow users to renew their lock
* make it so that locks do not trigger the ``auto_now`` or ``auto_now_add`` behavior of DateFields and DateTimeFields

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* Hard locks and soft locks (see :doc:`design`)
* improved test coverage with web client tests
* `locked` and `unlocked` managers on the `LockableModel` base model.

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* Initial open-source release
* Added packaging for PyPI
* Added a bunch of documentation, both for end-developers and to explain its underlying design
* Got rid of some assumptions and various little bits of hardcoding. E.g. urls are now constructed using Django's ``django.core.urlresolvers.reverse`` wherever possible.
* Static media serving using ``django-staticfiles``
* Added unit tests

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* Internal release