Add script to update all Maps:-based jsons

scripts/geojson/maps/update_all.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+function fetch() {
+	"./fetch_$1.sh" | json_reformat -m > "$1.json.tmp"
+	rm -f "$1.json"
+	mv "$1.json.tmp" "$1.json"
+}
+
+fetch streets
+fetch city_outlines