My current version of the main JS file. Still in development.

main.js

/**
 * Created by dor.t on 8/24/2014.
 */
var express = require("express"),
    path = require('path'),
    Promise = require('bluebird'),
    mongo = require('mongodb').MongoClient,
    mongoConn,
    app = express();

Promise.promisifyAll(mongo);
Promise.promisifyAll(require('mongodb/lib/mongodb/db').Db.prototype);
Promise.promisifyAll(require('mongodb/lib/mongodb/collection').Collection.prototype);
Promise.promisifyAll(require('mongodb/lib/mongodb/cursor').Cursor.prototype);

mongoConn = mongo.connectAsync("mongodb://127.0.0.1:27017/test");

app.set('views', path.join(__dirname, 'views'));
app.engine('html', require('hogan-express'));
app.set('view engine', 'html');

app.use(function getUserData(req, res, next) {
    mongoConn.then(function (db) {
        var collection = db.collection('users');
        return collection.find({"userName": req.headers.host.split('.')[0]}).limit(1).toArrayAsync()
    })
        .then(function (results) {
            results = results[0];
            //Todo: Check if results is empty, and render 404 page if it is.
            res.userInfo = results;
            console.log(results);
        }).catch(function (err) {
            res.userInfo = "No information available! " + err; //Todo: Render 500 page.
        }).then(function () {
            next();
        });
});

app.use('/', require('./routes/index'));

var server = app.listen(3000, function () {
    console.log("Listening on port %d", server.address().port);
});