Query string support

[prollynomial]

Add convenient access to query string parameters for routes.

e.g. /api/items/:id

function doContextChange(from, to, urlParams, queryParams) {
    // navigate to /api/items/1234?detailed OR /api/items/1234?detailed=true
    console.log(urlParams);
    // => { id: 1234 }
    console.log(queryParams);
    // => { detailed: true }
}