Integrate refactored `free_zipcode_data` gem

[midwire]

Once it is stable we need to integrate the free_zipcode_data gem for retrieving/updating location data, as the old data files are obsolete.

This will involve replacing the current rake tasks zipcodes:update_states - counties - countries etc.

[midwire]

We this dependent task to be completed before we can integrate: midwire/free_zipcode_data#4