[messaging] Petmail invitation codes, demo video

[Brian Warner]

.. and since a bunch of us are making videos to present at SOUPS
tomorrow, I'll post mine as well. This shows how invitation codes are
used in Petmail, both for connecting with correspondents and for setting
up Mailbox Servers (which queue your inbound messages, to deal with NAT
and intermittently offline agents).

  https://vimeo.com/100264833

It's fun to see the convergent evolution happening in this space. I'm
really looking forward to collaborating with everyone at the workshop
tomorrow.

cheers,
 -Brian