Blacklist government domains

[chjj]

Having hundreds of countries competing for the name of gov, gouv, gob, etc. is a bit ridiculous (the most popular government website gets to be the government?). I think we should just ignore all of those in the build. cc @hschoenburg

[chjj]

On second thought, it looks like we ignore the second-level domain if it's a government domain with 3 labels. There might not be too many gov/gouv/gob/govt 2-label domains. Will investigate.