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extend.js
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			/*!
			* node.extend
			* Copyright 2011, John Resig
			* Dual licensed under the MIT or GPL Version 2 licenses.
			* http://jquery.org/license
			*
			* @fileoverview
			* Port of jQuery.extend that actually works on node.js
			*/
			var is = require('is');

			function extend() {
			var target = arguments[0] \|\| {};
			var i = 1;
			var length = arguments.length;
			var deep = false;
			var options, name, src, copy, copy_is_array, clone;

			// Handle a deep copy situation
			if (typeof target === 'boolean') {
			deep = target;
			target = arguments[1] \|\| {};
			// skip the boolean and the target
			i = 2;
			}

			// Handle case when target is a string or something (possible in deep copy)
			if (typeof target !== 'object' && !is.fn(target)) {
			target = {};
			}

			for (; i < length; i++) {
			// Only deal with non-null/undefined values
			options = arguments[i]
			if (options != null) {
			if (typeof options === 'string') {
			options = options.split('');
			}
			// Extend the base object
			for (name in options) {
			src = target[name];
			copy = options[name];

			// Prevent never-ending loop
			if (target === copy) {
			continue;
			}

			// Recurse if we're merging plain objects or arrays
			if (deep && copy && (is.hash(copy) \|\| (copy_is_array = is.array(copy)))) {
			if (copy_is_array) {
			copy_is_array = false;
			clone = src && is.array(src) ? src : [];
			} else {
			clone = src && is.hash(src) ? src : {};
			}

			// Never move original objects, clone them
			target[name] = extend(deep, clone, copy);

			// Don't bring in undefined values
			} else if (typeof copy !== 'undefined') {
			target[name] = copy;
			}
			}
			}
			}

			// Return the modified object
			return target;
			};

			/**
			* @public
			*/
			extend.version = '1.0.8';

			/**
			* Exports module.
			*/
			module.exports = extend;