last-resort error handling to log errors and die

https://www.joyent.com/developers/node/design/errors
- use [domains](http://nodejs.org/api/domain.html#domain_domain) or ["uncaughtException"](http://nodejs.org/api/process.html#process_event_uncaughtexception) as a last-resort only, to catch uncaught errors, report them to the console, then terminate the process
