Fixes issues that caused IE7/8 to fail

[dfadler]

Reported #103

For some reason the else block test/parse.js and test/stringify.js are causing IE 7/8 to fail.
https://github.com/visionmedia/node-querystring/blob/master/test/parse.js#L3
https://github.com/visionmedia/node-querystring/blob/master/test/stringify.js#L4

To confirm the changes in the src are working property you will need to comment out the following within the else block of each of the previously mentioned file.

var qs = require('../')
    , expect = require('expect.js');