Geohashing pin

A geohashing marker, to serve for http://www.geohashing.org - it is meant to be stuck into the earth at the hash point. Or into whatever you find on location.

This thing is derived from crox' coin, which uses dawidi's tracing of the geohashing logo, which derives from the xkcd.com webcomic. Crox' coin is inspired by my own tin cast coins. This makes the license a bit of a mess - the xkcd comic is CC-BY-NC, which is why I am publishing it as such. It *may* be that the geohashing logo is actually under public domain.