Added initial South migration for django-adzone.
Added support for scheduling when ads start/stop being enabled.
Fixes #15.
Updated AdBase admin.
Added ad advertiser field to raw_id_fields.
Added advertiser user field to raw_id_fields.
Merge pull request #17 from melinath/admin_improvements

Admin improvements via @melinath
Corrected migrations to not overflow the max datetime.
Merge pull request #16 from melinath/ticket/15

Ticket/15 via. @melinath