initial import; first version after launch
30W compliant
updated map url
added cache generator
added gpl boilerplate
port to webpy 0.3
get Dow Jones value from geo.crox.net instead of yahoo.com

Yahoo doesn't seem to provide the DJI values for download any more.

Note: the crox_dji class is very simple and doesn't have a disk cache.
fix 30W compliance: hash calculation itself must always use current date
minor 30W compliance fix: treat -30.0 itself as "western area"
for completeness, also fix 30W compliance for dates before 2008-05-27
show distance (in km) to nearest geohash location

This takes the full coordinates given in request URL, checks all
neighboring graticules to find the geohash location with shortest distance
to original coordinates, and displays that coordinate and distance in RSS.
remove forgotten usage of yahoo_dji class
in request classes, keep geohash/crox_dji objects statically

This avoids reloading of DJI values from remote server for every request.
follow-up fix: declare geohash class before it is used as static member