added optional 'network interface' address option #1
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I was unable to receive some queries and found out that explicitly specifying a multicast interface in socket.addMembership solved this. I'm not sure exactly why (addMembership should add memebership to all valid interfaces by default), but it looks like this is not a rare issue: http://stackoverflow.com/questions/14130560/nodejs-udp-multicast-how-to
Therefore, I believe adding an option to specify the interface argument for the addMembership might be useful. I'm not very familiar with UDP, however - perhaps it would be even better to make it possible to specify multiple interfaces, etc.