Update to March GeoIP2 database
​[geoip-mar2015](https://gitweb.torproject.org/karsten/tor.git/log/?h=geoip-mar2015) contains the updated `geoip` file with IPv4 ranges and is supposed to be merged into maint-0.2.3. ​[geoip6-mar2015](https://gitweb.torproject.org/karsten/tor.git/log/?h=geoip6-mar2015) 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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