Add lat and longs for US Cities on open data census to make maps easier

[brendanbabb]

Add lat and longs for US Open Data City census cities and counties in the data export. This will allow more automated mapping of the data.

Example: https://brendanbabb.carto.com/builder/c1a98612-ba3d-4f08-914b-9c883eb0c235/embed
https://brendanbabb.carto.com/builder/c1a557b7-79d4-4ee3-a223-6f6fd70bdcd2/embed