#34 Adding _raop support

[Kyle Carter]

Ive been looking into how much support would be
needed to proxy the airport audio service, and it
looks like it is just simply adding a new type of
service to send responses to.
_raop._tcp.local looks like the service response to
reply to..

I will have a look also and see if this is an easy
addition to the source and add a patch if i get a
chance.

This will mean from itunes people will be able to
select the audio out to go to airport units on a
different subnet.