Classes for getting the distance of a route between two places using various different services. Included classes:
- GoogleMapsDistances: Google Maps Distance Matrix API
- OTPDistances: OpenTripPlanner (OTP)
- OSRMDistances: Open Source Routing Machine (OSRM)
- ValhallaDistances: Valhalla
Each class includes a distance(orig_long, orig_lat, dest_long, dest_lat) function that returns a dictionary containing the distance of the route in the "distance" index and the duration of the route in the "duration" index