#22 Add JNLP-file and demo-site

[Pål Brattberg]

We should have a publically available JNLP-file that lets
users test-run the latest version of the Roomba-EJB
client.

In order for this to be runnable, we should also require a
demo-installation of Roomba-EJB that would insert
fresh, good, decent (!) startdata at regular intervals.

This will probably make it much easier to attract new
users as the barrier to entry is very low using Web Start
or equivalent clients.