Get migration 0003 to work on postgres despite http://south.aeracode.org/ticket/484.

The clean way to do it would have been 3 migration (2 schema, 1 data), but I see no way to do it to do it without breaking previously successful migrations. The clean way to do it would be 3 migration (2 schema, 1 data), but I saw no way to do 3 migrations without breaking on systems where migration 0003 was previously successful migrations.