Augment the ServletConfiguration.Builder class such that a Servlet
instance can be configured into teh underlying Jetty ServletHolder.

This allows you to do define tidy anonymous servlets in unit testing
base classes and/or frameworks..

        ServletConfiguration.Builder sConfig = new ServletConfiguration.Builder();
        sConfig.withServlet(new HttpServlet() {
            @Override
            protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
                System.out.printf("uri: %s\n", req.getRequestURI());
            }
        }).withPathSpec("/*");
Bump build to version 1.3.3.