geocoder REST update

geocoder REST interface update

Now US zips and UK postcodes can be looked up via the REST interface. And 3 letter ISO country codes can be used.

Behind the scenes, the script has been massaged to be as efficient as possible. Every microsecond counts, as this popular geocoder is presently running on shared hosting, and using significant CPU.

As always, please get in touch if you are using the REST interface, so I have a contact for any issues that might arise.