Doesn't work on OS 10.10

[daviddias]

Managed to get successfully it running on Linux (even using multicast-dns library for node/go interop). However in Mac OS X, can't seem to get services published by the lib to be found by the same lib or other libs that implement mDNS.

multicast-dns works fine on Mac OS X though, so there should be something specific to go mdns lib.

[daviddias]

update:

following @jbenet upgraded example #42, mdns does now work properly in Mac OS X

However, multicast-dns and mdns are not interop'ing completely. One can see the queries issued by the other, but multicast-dns never receives the response/service announcement from mdns