Script up a simple 2-node BigCouch cluster
Deploy BigCouch cluster as an auto-scaling group.

The self-registering behaviour doesn't work quite right just yet,
but it's a very intersting start.
Switch to python cloud-init script, for more reliable peer registration.
Register peers by writing to local management port.

This means that only the GET /nodes/_all_docs request needs to be
performed via the public interface, so we're free to lock down the
rest of the management functionality in nginx.
Switch back to 'bigremote.couch' hostname for bigcouch deploy.
Tweak BigCouch node startup to more reliably detect peers.
Restructure repo a little, based on BigCouch experiments.

Deploying from this repo will now create just a BigCouch cluster, not
a 'local' and 'remote' pair of CouchDB instances.  We seem to be far
enough along in client development that the stand-alone CouchDBs are
not needed.