Update to February GeoIP2 database

Finally, and thanks to Nick's efforts on dumping MaxMind's GeoIP2 database format, we have updates for src/config/geoip and src/config/geoip6. Three branches, all in my public repository:

• mmdb-convert contains Nick's mmdb-convert.py script with some tweaks he already merged on GitHub and with two more tweaks that are only in my branch: the first tweak (749ead79) is trivial, but the second (436f7106) is quite important for the geoip6 file. Without that commit, we'd include a full copy of IPv4 assignments to the Teredo IPv6 address space 2001::/32. This branch also removes our previous workaround that cleaned up A1 ranges from GeoIP databases using the old format. This branch is supposed to be merged into master.

• geoip-feb2014 contains the updated geoip file with IPv4 ranges and is supposed to be merged into maint-0.2.2.

• geoip6-feb2014 contains the updated geoip6 file with IPv6 ranges and is supposed to be merged into maint-0.2.4 (the first maint-* branch that contains a geoip6 file).