Django-otp

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- Update Django requirement to 1.4.2, the first version with django.utils.six.

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- Fix unicode representation of devices in some exotic scenarios.

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- Now supports Django 1.4 to 1.6 on Python 2.6, 2.7, 3.2, and 3.3. This is the
first release for Python 3.

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- Add :func:`django_otp.user_has_device` to detect whether a user has any
devices configured. This change supports a fix in django-otp-agents 0.1.4.

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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.