Added the south plugin.

Here is the routine for setting up South:

$POSTGRESQL_BIN/createuser --user postgres --no-createdb --pwprompt --no-createrole --no-superuser --encrypted pollsuser
$POSTGRESQL_BIN/createdb  --user postgres --owner pollsuser pollsdb
python manage.py syncdb
python manage.py schemamigration polls  --initial
python manage.py migrate polls

With further model changes:

python manage.py schemamigration polls --auto
python manage.py migrate polls