Remove unncessary freeze_time in tests.
Remove unncessary freeze_time in tests.

Also, that freeze_time, for a 2015 date, was generating a warning
during testing: "SystemTimeWarning: System time is way off (before 2016-01-01). This will probably lead to SSL verification errors"

philgyford/django-ditto,philgyford/django-ditto,philgyford/django-ditto