Discover.coffee:
 - Dropped networkInterface, mdns listens and receives on all interfaces.
 - Added to message emitted the service name and the interface (allows IPv6).
 - Dropped _isIPv4 function and ipv4 filter.

Network.coffee
 - Added support to IPv6.
 - The clients can connect to two or more servers.
 - Changed the ip property value to the machine's name.