Provide a param observable instead of value

[Hypnosphi]

An example from readme:

const routes = {
  '/:id': id => sources => YourComponent({props$: Observable.of({id}), ...sources})
}

Here, whenever the id is changed, a new YourComponent is created. It would be nicer to have something like

const routes = {
  '/:id': param$ => sources => YourComponent({param$, ...sources})
}

Where param$ emits values of form {id}

[TylorS]

Yeah this would be cool, but I'm going to be away for a week. Won't be able to do this myself.