add ssdp listener and notifier. graceful shutdown not yet implemented #20
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Simple Service Discovery Protocol is a UDP multicast protocol that will enable a babysitter to discover running instances of decide-core on a local network.
This pull request adds two tasks to decide-core, one that responds to discovery requests, and another that emits SSDP notifications at intervals of a minute or so. The tasks are not well integrated into the overall application yet, and I haven't figured out how to catch and handle Ctrl-C/SIGINT in a way that gracefully shuts down both the SSDP notifier (which would cause it to emit the "ssdp:byebye" message), but it should provide enough basic functionality to start work on the babysitter. A more detailed look at how we handle shutdowns (see issue #18) is needed.