Add routes method to chain object

[jknack]

{
  use("*", (req, rsp, chain) -> {
    List<Route> routes = chain.routes();
    assertEquals("f1", routes.get(0).name());
    assertEquals("f2", routes.get(1).name());
    assertEquals("f3", routes.get(3).name());

    chain.next(req, rsp);
  }).name("f1");

  use("/users/**", (req, rsp, chain) -> {
    List<Route> routes = chain.routes();
    assertEquals("f2", routes.get(0).name());
    assertEquals("f3", routes.get(1).name());

    chain.next(req, rsp);
  }).name("f2");

  get("/users", req -> {

  }).name("f3");

}

The routes method give us access to current and next matching routes in the pipeline.