tidy up serve tool, adds 'gulp serve' task

tools/serve.js

@@ -0,0 +1,56 @@
+var connect = require('connect');
+var express = require('express');
+var serveStatic = require('serve-static');
+var morgan  = require('morgan');
+var colors = require('colors');
+var	argv = require('optimist').argv;
+var	portfinder = require('portfinder');
+var logger, port;
+var log = console.log;
+
+function start(_port) {
+ if (!_port) {
+    portfinder.basePort = 8080;
+    portfinder.getPort(function (err, openPort) {
+      if (err) throw err;
+      port = openPort
+      listen(port);
+    });
+  } else {
+    listen(_port);
+  } 
+}
+
+//CORS middleware
+function allowCrossDomain(req, res, next) {
+    res.header('Access-Control-Allow-Origin', '*');
+    res.header('Access-Control-Allow-Methods', 'GET,PUT,POST,DELETE');
+    res.header('Access-Control-Allow-Headers', 'Content-Type');
+
+    next();
+}
+
+
+function listen(port) {
+  var server = express();
+  server.use(allowCrossDomain);
+  server.use(serveStatic(__dirname + "../../"));
+
+  if(!logger) server.use(morgan(logger))
+
+  server.listen(port);
+
+  log('Starting up Server, serving '.yellow
+    + __dirname.replace("tools", '').green
+    + ' on port: '.yellow
+    + port.toString().cyan);
+  log('Hit CTRL-C to stop the server');
+
+}
+
+process.on('SIGINT', function () {
+  log('Server stopped.'.red);
+  process.exit();
+});
+
+module.exports = start;