ensure that the internal code_update URL is hit *precisely* to reduce the risk of improperly configured servers and sloppy expressjs routing letting just anyone reboot a server.  bug #699171

implement graceful process shutdown, and clear logging as to the reason why processes are terminating.  include winston handling of uncaught exceptions.  this all goes into a library that all of our processes use.  closes #529

ensure that the internal code_update URL is hit *precisely* to reduce the risk of improperly configured servers and sloppy expressjs routing letting just anyone reboot a server.  bug #699171

implement graceful process shutdown, and clear logging as to the reason why processes are terminating.  include winston handling of uncaught exceptions.  this all goes into a library that all of our processes use.  closes #529