Switch to South
Merge branch 'develop' into feature/5-use-south
Fix the load_fixtures.sh script for South
Merge branch 'develop' into feature/5-use-south

Conflicts:
	requirements/project.txt
Merge branch 'develop' into feature/5-use-south

Conflicts:
	symposion/settings.py
Refs #5: Add migrations related to changing markdown implementation

These correspond to the old migrations/023_remove_rendered_columns.sql
Refs #5: remove old migration

Removed migrations/023_remove_rendered_columns.sql
Refs #5: Just do initial migrations

Instead of trying to make the initial migrations match pycon2013
and then add migrations for our changes since then, just start with
what we have now. Otherwise we'll be stuck forever with migrations
that require django-markitup, which we don't use anymore.
Merge branch 'feature/5-use-south' into develop