Added get_most_like_by_FIELD helper method.
Safely replace None with []
Added lower option to TagField
Added TagQuerySet.most_like method.
Remove debug kruft from fixing previous bug.
Ensure we remove ordering from querysets we're going to count to avoid extra fields in the group by ruining the count.
Fixed setting base_field so it didn't break Migrations Removed contribute_to_class
Initial release