Unifaun services data seed

- `rake unifaun:import_partners` will import all the partners carriers as `Unifaun::Carrier`
- `rake unifaun:import_carrier_services ` will import all the associated services as `Unifaun:: CarrierService` models 
- Partner data added as files in db/data. Each file is named by the code of the partner. 
- Some additions/changes to specs