Socket: Not running issue when disconnecting cluster

[AlexMeah]

First off great module, unfortunately we are seeing a high number of the error below when cycling boxes during deployment.

Error: Not running
    at Socket._healthCheck (dgram.js:420:11)
    at Socket.send (dgram.js:272:8)
    at Lynx.send (/usr/local/moonstick/node_modules/lynx/lib/lynx.js:470:10)
    at Lynx.count (/usr/local/moonstick/node_modules/lynx/lib/lynx.js:310:8)
    at Lynx.increment (/usr/local/moonstick/node_modules/lynx/lib/lynx.js:228:8)
    at module.exports (/usr/local/moonstick/lib/middleware/requestStats.js:8:13)

I have put together a simple example to reproduce the error

var Lynx = require('./lib/lynx');
var cluster = require('cluster');

var metrics = new Lynx('localhost', 2056);

if (cluster.isMaster) {
    for (var i = 0; i < 1; i++) {
        cluster.fork();
    }

    cluster.on('exit', function (worker, code, signal) {
        console.log('worker ' + worker.process.pid + ' died');
    });

    cluster.on('online', function (worker, code, signal) {
        console.log('worker ' + worker.process.pid + ' online');
        cluster.disconnect();
    });
} else {
    metrics.increment('node_test.int', 1);
}

We could add a custom error handler and filter these but I believe it is a issue with Lynx as googling the stack shows similar issues in other module which use dgram.