adds ability to set an env in the app context

examples/default_router.go

@@ -9,7 +9,7 @@ import (
 
 func main() {
 	router := tuu.NewRouter()
-
+	router.SetEnv("dev")
 	router.GET("/home", func(ctx tuu.Context) error {
 		ctx.Set("template_data", "some value")
 
@@ -26,7 +26,11 @@ func main() {
 	})
 
 	app := tuu.New(router)
-	if err := app.Serve(); err != nil {
+	if err := app.Serve(tuu.Config{
+		IPAddr: "127.0.0.1",
+		Port:   "8080",
+		Env:    "dev",
+	}); err != nil {
 		panic(err)
 	}
 }