Move census tract data to a more generic structure
Use Geo models for view returns
Fix tests for geo shapes
Use the Geo model when importing census tracts
Change FKs to point to the Geo model
Drop the census-tract-specific model
Make sure the stats data point to the Geo model instead of the census
Merge branch 'master' of https://github.com/cfpb/mapusaurus into unified-shape
Add loading script for US counties
Merge pull request #55 from cmc333333/county-import

County import