Deprecate the legacy *.csv files.

[midwire]

We have to time this carefully and coordinate with my_zipcode_gem because it currently depends on these 3 files:

• all_us_counties.csv
• all_us_states.csv
• all_us_zipcodes.csv

Once we get a stable solution in place here using the GeoNames data, we can update the my_zipcode_gem rake tasks to use that solution and remove these files.

[midwire]

Since my_zipcode_gem currently uses these *.csv files which are being deprecated, we need to replace these *.csv files with something else, there are 2 likely strategies:

1. Generate the data files *.sqlite3 and/or *.csv at a given point in time, and check those into the repository here for importing into that gem. my_zipcode_gem will need some work to directly pull that data from this repository for importing there.
2. Allow the my_zipcode_gem’s users to generate their own up-to-date data using the tools/rake tasks provided by this gem, and import the resulting data directly.