#49 Multiple test servers

[Ross Gardler]

Currently we are able to attempt to run multiple
servers on the same port. What we need to do is disable
the start action when a server is already running (and
disable stop when one is not running).

It would also be good to be able to run multiple
servers so that different projects can be displayed at
the same time. This will require servers to be run on
different ports for each project.