Initial commit.

Initial code from David Mosberger-Tang @ eGauge Systems LLC.

http://www.mostang.com/~davidm/nbnsd/
Add basic Makefile.
Add signal handler to quit on SIGINT and SIGTERM.
Respond to queries with the most relevant IP address

Instead of returning a pre-defined IPv4 address for all queries,
scan through the interface list using getifaddrs(), and return
the most appropriate address based on the sender address.
Merge branch 'master' of https://github.com/jmaggard10/nbnsd

Conflicts:
	nbnsd.c