Workspaces v1 prerelease plans

As this Workspaces release is going to mean several changes across the site, we'll
be deploying a copy of GDN (including the new Workspaces bits) on an internet facing
server in the next few days to try things out before we go live.

For those interested, anyone will be welcome to come take a sneak peak at what
we've got in store for v1 on that prerelease site. Watch this space for details.