Recent authors

Added an endpoint that allows you to check whether an OAE user has made
a change to a pad in the last 15 minutes. Edits are tracked per pad/user
and are periodically cleaned.
In Hilary, we bind to `git://github.com/oaeproject/node-amqp#0.1.8.x`. Should we be binding to the same one here to make sure we don't have any incompatibility issues?