Добавлена сборка массива параметров. ex: ?param=foo&param=bar -> param: ['foo', 'bar']

parse_query

var deserializeQuery = function () {
    return location.search.substr(1)
        .split('&')
        .map(function (pair) {
            pair = pair.split('=');
            try {
                pair[1] = pair[1] !== undefined ? decodeURIComponent(pair[1]) : true;
                if (typeof pair[1] === 'string') {
                    pair[1] = pair[1].replace(/\+/g, ' ');
                }
            } catch (err) {
                console.error('Query parameter ' + pair[0] + ' is not correct');
                pair = null;
            }

            return pair;
        })
        .filter(Boolean)
        .reduce(function (prev, next) {
            var key = next[0],
                value = next[1];
            prev[key] = prev[key] ?
                prev[key] instanceof Array ? prev[key].concat([value]) : [prev[key], value]
                : value;
            return prev;
        }, {});
};