Provide IE11 polyfill for URLSearchParam API

URLSearchParam is a Javascript API dedicated to manipulate the URL query parameters easily. The API is supported by most of the browsers except IE11 (see: https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams). It would be handy to be able to use directly this API instead of reinventing the wheel for this kind of usage, and a polyfill has been already written to support it on IE11 licensed with MIT: https://github.com/jerrybendy/url-search-params-polyfill so I suggest we start including this polyfill.