Add -tags netgo
Move usage of mdnsClient after initialization
Forward DNS requests that aren't for our 'weave' domain
Reply with array of addresses for delegated query
Concatenate multiple replies received over mDNS
Shorten mDNS timeout
Check number of results received
Use specified port for http listener
Removed cross-compilation bobbins

Cross-compilation isn't working, and it's misleading to suggest it
does by having these here.