Allow passing the port to silk when starting

[zodern]

It could also use a random port if 3000 is already in use.

[formula1]

I'll look further into this, however we can use somthing like dnsmasque

http://superuser.com/questions/544875/how-to-register-subdomains-on-dnsmasq

Here, we can register subdomains, (ideally on the fly though maybe not)
Another option is to look at the internals of how dnsmasq works and reimpliment it in js to allow more dynamic configurations.

This sort of thing would only be available on node-os however