utils.js

// http://youmightnotneedjquery.com
window.utils = {

    // extend({}, objA, objB)
    extend: function (out) {
        out = out || {};

        for (var i = 1; i < arguments.length; i++) {
            if (!arguments[i]) {
                continue;
            }

            for (var key in arguments[i]) {
                if (arguments[i].hasOwnProperty(key))
                    out[key] = arguments[i][key];
            }
        }

        return out;
    },

    // deepExtend({}, objA, objB)
    deepExtend: function (out) {
        out = out || {};

        for (var i = 1; i < arguments.length; i++) {
            var obj = arguments[i];

            if (!obj) {
                continue;
            }

            for (var key in obj) {
                if (obj.hasOwnProperty(key)) {
                    if (typeof obj[key] === 'object')
                        deepExtend(out[key], obj[key]);
                    else
                        out[key] = obj[key];
                }
            }
        }

        return out;
    },

    // @returns {String} a=Foo&b=Bar
    buildParameterString : function(object) {
        var keys = Object.keys(object);

        return keys.map(function(k) {
            return k + "=" + object[k];
        }).join("&");
    }
};

// bind polyfill for PhantomJS
if (!Function.prototype.bind) {
    Function.prototype.bind = function (oThis) {
        if (typeof this !== "function") {
            // closest thing possible to the ECMAScript 5 internal IsCallable function
            throw new TypeError("Function.prototype.bind - what is trying to be bound is not callable");
        }

        var aArgs = Array.prototype.slice.call(arguments, 1),
            fToBind = this,
            fNOP = function () {},
            fBound = function () {
                return fToBind.apply(this instanceof fNOP && oThis
                    ? this
                    : oThis,
                    aArgs.concat(Array.prototype.slice.call(arguments)));
            };

        fNOP.prototype = this.prototype;
        fBound.prototype = new fNOP();

        return fBound;
    };
}