Any interest in moving away from state/country tables in favor of carmen

Is there any interest in a PR to move to using [**carmen**](https://github.com/jim/carmen) and codes for states / countries instead of actual tables and models?

It provides all the same ISO name and code information and goes a bit further by providing localized names of the countries and regions.  The only thing it doesn't provide is the `states_required` functionality but it may be able to be emulated using presence of regions in the gem and the setting of the config flag.

Anyway, figured I'd ask as I am doing this in a separate project and also had a few issues when recently migrating to Spree due to the problems in the world seed data.