Add new Router for more idiomatic Scala

[Narigo]

Create a Router trait that is extendable and lets you do things like

class MyRouter extends Router {
  override def request(req: HttpServerRequest) = {
    case Get("/") => SendFile("index.html")
    case Put("/user/1") =>
      (for {
        user <- updateUser(req)
      } yield Ok(user)) recover {
        case ex: UpdateUserException => Error(ex)
      }
  }
}

[galderz]

Integrated in master.