exit on process error

From the iojs docs:

> An unhandled exception means your application - and by extension io.js itself -
> is in an undefined state. Blindly resuming means anything could happen.
>
> Think of resuming as pulling the power cord when you are upgrading your system.
> Nine out of ten times nothing happens - but the 10th time, your system is bust.
>
> uncaughtException should be used to perform synchronous cleanup before shutting
> down the process. It is not safe to resume normal operation after
> uncaughtException. If you do use it, restart your application after every
> unhandled exception!

www.js

@@ -5,6 +5,7 @@ var cluster = require("cluster");
 
 process.on("uncaughtException", function(err) {
   logging.error("uncaughtException", err.stack || err.toString());
+  process.exit(1);
 });
 
 if (cluster.isMaster) {