added support for specifying which ports to use

if no port is specified in config.json port from url will be used if no
port in url then default to 4567

port in config.json can be an array or a single port number

loader.js

@@ -1,7 +1,6 @@
 'use strict';
 
 var	nconf = require('nconf'),
-	net = require('net'),
 	fs = require('fs'),
 	url = require('url'),
 	path = require('path'),
@@ -16,7 +15,6 @@ var	nconf = require('nconf'),
 	output = logrotate({ file: __dirname + '/logs/output.log', size: '1m', keep: 3, compress: true }),
 	silent = process.env.NODE_ENV !== 'development',
 	numProcs,
-
 	workers = [],
 
 	Loader = {
@@ -153,6 +151,7 @@ Loader.addWorkerEvents = function(worker) {
 };
 
 Loader.start = function(callback) {
+	numProcs = getPorts().length;
 	console.log('Clustering enabled: Spinning up ' + numProcs + ' process(es).\n');
 
 	for (var x=0; x<numProcs; ++x) {
@@ -165,15 +164,18 @@ Loader.start = function(callback) {
 };
 
 function forkWorker(index, isPrimary) {
-	var urlObject = url.parse(nconf.get('url'));
-	var port = urlObject.port || nconf.get('port') || nconf.get('PORT') || 4567;
+	var ports = getPorts();
+
+	if(!ports[index]) {
+		return console.log('[cluster] invalid port for worker : ' + index + ' ports: ' + ports.length);
+	}
 
 	var worker = fork('app.js', [], {
 		silent: silent,
 		env: {
 			isPrimary: isPrimary,
 			isCluster: true,
-			port: parseInt(port, 10) + index
+			port: ports[index]
 		}
 	});
 
@@ -192,6 +194,15 @@ function forkWorker(index, isPrimary) {
 	}
 }
 
+function getPorts() {
+	var urlObject = url.parse(nconf.get('url'));
+	var port = nconf.get('port') || nconf.get('PORT') || urlObject.port || 4567;
+	if (!Array.isArray(port)) {
+		port = [port];
+	}
+	return port;
+}
+
 Loader.restart = function(callback) {
 	killWorkers();
 
@@ -233,9 +244,6 @@ nconf.argv().file({
 	file: path.join(__dirname, '/config.json')
 });
 
-numProcs = nconf.get('cluster') || 1;
-numProcs = (numProcs === true) ? require('os').cpus().length : numProcs;
-
 if (nconf.get('daemon') !== false) {
 	if (fs.existsSync(pidFilePath)) {
 		try {