add a javascript util module

Utils.js

var http = require('http')
	, parse = require('url').parse
	, sep = require('path').sep;

exports.error = function(msg, code) {
	var err = new Error(msg || http.STATUS_CODES[code]);
	err.status = code;
	return err;
}

exports.merge = function(a, b) {
	if(a && b) {
		for(var key in b) {
			a[key] = b[key];
		}
	}

	return a;
} 

exports.escape = function(html) {
	return String(html)
		.replace(/&(?!\w+;)/g, '&')
		.replace(/</g, '&lt;')
		.replace(/>/g, '&gt;')
		.replace(/"/g, '&quot;');
}

exports.parseUrl = function(req) {
	var parsed = req._parsedUrl;
	if(parsed && parsed.href == req.url) {
		return parsed;
	} else {
	    parsed = parse(req.url);
	    
	    if(parsed.auth && !parsed.protocol && ~parsed.href.indexOf('//')) {
	        parsed = parse(req.url.replace(/@/g, '%40'));
	    }
	    
	    return req._parsedUrl = parsed;
	}
}

exports.inherits = function(ctor, superctor) {
	ctor.super_ = superctor;
	ctor.prototype = Object.create(superctor.prototype, {
		constructor: {
			value: ctor,
			writable: false,
			enumerable: false,
			configurable: false
		}
	});
}