[nznog] pgp key signing

If you want to sign keys this afternoon, and you're currently frantically scrabbling with gpg to try and get your keys into the web page, please continue trying until 4pm. Just after 4pm I'm going to take a snapshot of the keyring, and that's what we'll use for the signing shenanigans. If you haven't figured it out by 4pm, then you can stop trying then :-)