Replace coords array property with lat, lon.

lib/(address, addresses/(openaddresses, osm, tiger)).js
	-Flatten the `Address.coords` array to `lat` and `lon`
	properties.
	-Modify dataset-importer `Address()` calls accordingly.
Merge branch 'refactor/flatten_coords' into develop

lib/address.js
	-Flatten the `Array.coords` array into `lat`/`lon` properties.