provide persistent caching

[schachmat]

Heyho,

could you add caching functionality in your lib? The queries should be stored somewhere persistent on disk possibly surviving reboots (e.g. simple file or sqlite database).

[p]

Persistence can be accomplished in many ways and is outside the scope of a geocoder. I have a similar need and achieved it with gob and bbolt (https://github.com/p/weather/blob/master/backend/src/weather.go).