added a numeric key in array stringify by default to make sure data is parsable again
added a numeric key in array stringify by default to make sure data is parsable again

tj/node-querystring,npmcomponent/visionmedia-node-querystring,monsterwater/node-querystring,modulexcite/node-querystring,modulexcite/node-querystring,gastrodia/node-querystring,gastrodia/node-querystring,monsterwater/node-querystring