timezone aware datetime for deleted_at
tz_aware mongodb connection
use self.assertRaises Exception instead, more appropriate
tz_aware and StreamingHttpResponse fixes
use dateutil.parser to parse date string
do not remove timezone info from datetime fields heading into mongo
Revert "do not remove timezone info from datetime fields heading into mongo"
Need to make decision on this later on
This reverts commit dcb5c71ceca0a1ab092bcde3092b78c2920035bc.
use django.util.dateparse to convert string to a tz_aware datetime object
also pick user so as select_related to work as expected