tweaked server.go to have a more informative servlet.Start() experience

servlet/server.go

@@ -68,9 +68,12 @@ func (s *VinegarServlet) ServeHTTP(w http.ResponseWriter, req *http.Request) {
 
 func (s *VinegarServlet) Start() {
 	if len(s.Routes) < 1 {
-
+		log.Fatal("No routes found for server. Nothing to listen and serve.")
+		os.Exit(1)
 	}
 
+	log.Printf("Listening on [%s]\n", s.Port)
+
 	err := http.ListenAndServe(s.Port, s)
 
 	if err != nil {