add GeoIP support

[mac-zhou]

pls add GeoIP support, 3ks

[pmarks-net]

You can right-click an IP address, and select "Look up address on bgp.he.net".

In theory, it'd be possible to make the URL configurable via the options page. Which GeoIP service would you like to use?

[mac-zhou]

i want to make the URL configurable via the options page😄