Use graticule names instead of coordinates

[bergie]

Now the Geohash adventures are named as "Geohash for 60, 24". It would be nicer to show this as "Geohash for Helsinki, Finland" for those graticules that have been named.

The graticule list is on http://wiki.xkcd.com/geohashing/All_Graticules with a downloadable raw version in http://wiki.xkcd.com/geohashing/All_Graticules?action=raw

The entries in that list use the following format:

[[Larache, Morocco|35, -6 (Larache, Morocco)]]

[cannonerd]

Perhaps, perhaps. I have to think this through.