failing test for #4245

I've been starring at this code for a while now and am not getting any where.  Figured I would push the failing test and what I know in case someone else has the skill to push this forward. (hint @machty).

Basically we need to make it so `queryParamsDidChange` whenever query params change, and not just for noop transitions. If I do this in router.js i can get the ember test to pass, but I'm struggling writing tests in router.js for this situation. For whatever reason i can't get a failing test.

Here is the related code in router.js
https://github.com/tildeio/router.js/blob/master/lib/router/router.js#L59