Prevent node's default action when emitting "error"

[matthewmueller]

When an EventEmitter instance experiences an error, the typical action is to emit an 'error' event. Error events are treated as a special case in node. If there is no listener for it, then the default action is to print a stack trace and exit the program.

This is a terrible, terrible default. Right now it's exiting our the program before hitting the switch statement if you don't have your own app level listeners.