nixos: murmur service

Murmur is the headless server component of the Mumble chat system.

Signed-off-by: Austin Seipp <aseipp@pobox.com>
nixos: add mumble test

This tests that both the client and server work. With screenshots!

Signed-off-by: Austin Seipp <aseipp@pobox.com>
Merge branch 'murmur' of git://github.com/thoughtpolice/nixpkgs

nixos: add Murmur module (Mumble chat)

Conflicts:
	nixos/modules/misc/ids.nix