jQuery Plugins Working for GitCandy

jQueryPlugin.js

/*
GitCandy is a Git platform based on ASP.NET MVC

Source on: http://github.com/Aimeast/GitCandy
Demo on: http://git.53wb.com/

The MIT License (MIT)

Copyright (c) 2014 Aimeast
*/

; (function ($, undefined) {
    'use strict';

    $.extend({
        queryString: {
            parse: function (str) {
                /*!
                    https://github.com/sindresorhus/query-string
                    by Sindre Sorhus
                    MIT License
                */
                var set = typeof str === 'undefined';

                if (set && $.queryString.parsed)
                    return $.queryString.parsed;

                var segments = (set ? window.location.search : str).replace(/^\?/, '').split('&');

                var ret = {};
                segments.forEach(function (param) {
                    var parts = param.replace(/\+/g, ' ').split('=');
                    var key = parts[0];
                    var val = parts[1];
                    if (!(key && val))
                        return;

                    key = decodeURIComponent(key);
                    // missing `=` should be `null`:
                    // http://w3.org/TR/2012/WD-url-20120524/#collect-url-parameters
                    val = typeof val === 'undefined' ? null : decodeURIComponent(val);

                    if (!ret.hasOwnProperty(key)) {
                        ret[key] = val;
                    } else if (Array.isArray(ret[key])) {
                        ret[key].push(val);
                    } else {
                        ret[key] = [ret[key], val];
                    }
                });

                var parsed = {
                    query: ret,
                    get: function (key, ignoreCase) {
                        var ign = !!ignoreCase;
                        if (ign)
                            key = key.toUpperCase();

                        var keys = Object.keys(ret);
                        for (var i in keys) {
                            var prop = keys[i];
                            if (ign && key === prop.toUpperCase()
                                || !ign && key === prop) {
                                return ret[prop];
                            }
                        }
                    }
                };

                if (set)
                    $.queryString.parsed = parsed;

                return parsed;
            }
        }
    });

    $.queryString.query = $.queryString.parse().query;
    $.queryString.get = function (key, sensitive) {
        return $.queryString.parse().get(key, sensitive);
    };

})(window.jQuery);