Work on #2: fix import script.

import.sh
	-Fix a bug in the import script that's causing #2:
	-The import script performs two splits with `mapshaper`: one
	partitions the Quattroshapes shapefile by ISO CC code
	(`gn_adm0_cc`), and the second, by state name (`name_adm1`). The
	first split used the shapefile format, while the second uses
	GeoJSON.  Mapshaper seemed to screw up encoding when writing to
	shapefiles, so opt for GeoJSONs in the first split as well.