Option to enable Google geocoding service

[saltymouse]

I noticed you recently switched from Google's geocoding service to the OpenStreetMaps Nominatim service. While it's nice to not manage API keys, the Google service often has fewer mistakes (and thus less confusion for clients using this plugin).

For example the following address does not work on Nominatim because it doesn't understand the "Suite" portion of the address: 9206 200th St SE Suite C-5, Snohomish, WA

But works fine in Google's geocoder: https://developers.google.com/maps/documentation/javascript/examples/geocoding-simple

Is is possible to add Google as an option to enable for those who want it?