Add initial South migration.
Add approval_status field to vendor model

Also create a migration.
Change vendor code to use approval_status field.

Remove the use of the boolean flag "approved" in favor of an
approval_status field. Added data migration to populate
approval_status.
Remove auto-approve "feature"

This feature has been removed from all public data entry pages.
Also worth noting that the previous commit would have broken
this feature, but we were planning to remove it anyway.
Remove approved field.

Now that migrations and modifications are made to use approved_status
this commit removes the approved boolean field.
Fix data.json for new schema.

The db schema has changed, so for those that cannot migrate
because they are using the "lite" development environment without
South, they will have a dataset that works.