Provide a "Request.continue()" that performs the original request

[MP0w]

As discussed here #140 (comment) and here #140 (comment)

This would let you fallback on the original response.
I want to discuss to understand if we should add this to Kakapo or not.

example

router.get("/users/:id") { request in
  if wantToHandleIt {
     return something  
  }
  return request.continue()
}

API naming could also be Request.original() or something like that.