collaborative

It's actually called Etherpad Lite but i hate that spelling.

This will be a copy-paste of http://mclear.co.uk/2011/08/01/install-etherpad-lite-on-ubuntu/ except for a few things taken from https://github.com/Pita/etherpad-lite#readme and workarounds when things do not go as planned.

A test: I gave one GMail account edit access to another GMail account (yes, you can do this) and started editing an e-mail, saved it as draft, and then went to the other account— the draft was there, but not only was there no autorefresh of the other's changes when i edited simultaneously, but it forked and created two drafts of the same e-mail.