Django-otp

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- Add if_configured argument to :func:`~django_otp.decorators.otp_required`.

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- Major unit test cleanup. Tests should pass or be skipped under all supported
versions of Django, with or without custom users and timzeone support.

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- OTPAdminSite now selects an apporpriate login template automatically, based on
the current Django version. Django versions 1.3 to 1.5 are currently
supported.

- Unit test cleanup.

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- Add support for custom user models in Django 1.5.

- Stop using ``Device.objects``: Django doesn't allow access to an abstract
model's manager any more.

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- Fix an exception when an empty login form is submitted.

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Initial release.