Ensure timeouts are handled
Replace locations/areas with postcode field

- Remove Location selection
- Add Business postcode field
- Ensure updated to postcode field don't fire JS filtering
Remove redundant Area model
Merge pull request #65 from alphagov/add_postcode_field

Add postcode field to search
Update BSF need id
Merge pull request #66 from alphagov/fix_need_id

Update BSF need id