Update timezone fix to work with Django 1.3
Update timezone fix to work with Django 1.3

The fix for issue #43 in pull request #44 only works in Django 1.4 and earlier. Pennyblack needs to work with Django 1.3, so try to import `django.utils.timezone.now`, but if that fails then fall back to datetime.now

nickburlett/pennyblack,nickburlett/pennyblack