Move test tructure to the latest version.

- `unit` becomes `models`
- `functional` becomes `controllers`
No need to specify full path of test_helper anymore.
Fixtures are kind of broken right now.
Remove ancient test_parser initialization.
Add required helper.
Readd all fixtures.
Wrong class name.
Make local_config optional.

Stuff will break, etc.
Don't explode on nil.
Accepts "MB_DATABASE_URL" to set database connection.
Sort variable names.
Downgrade structure dump to PostgreSQL 9.1.