Update to April GeoIP2 database
geoip-apr2015 contains the updated geoip
file with IPv4 ranges and is supposed to be merged into maint-0.2.3.
geoip6-apr2015 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).