Conversion between geo-types and postgis types.
Examples
Convert a postgis point to a geo-types point:
use FromPostgis;
let postgis_point = Point ;
let geo_point = from_postgis;
assert_eq!;
Convert a geo-types point to a postgis point:
use ToPostgis;
let geo_point = point!;
let postgis_point = geo_point.to_postgis_with_srid;
assert_eq!;