this makes the url router adjust the url when the navigation path is
changed, instead of doing urlRouter.applyUrl() and
urlRouter.history.pushUrl().
This history field and applyUrl method on URLRouter are now private,
as the URLRouter should only be used to generate urls you want to
put in an <a href="..."></a>, anything else should use navigator.push()
this brings back index addressing rather than x y in the grid vm,
as we need to have a css class for every position for IE 11,
as we can't use css variables and autoprefixer can
translate grid-areas
