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).

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