Add interactive configuration

This adds a new --config flag and rearranges some config fields.

app.go

@@ -36,6 +36,7 @@ var shttp = http.NewServeMux()
 
 func Serve() {
 	createConfig := flag.Bool("create-config", false, "Creates a basic configuration and exits")
+	doConfig := flag.Bool("config", false, "Run the configuration process")
 	flag.Parse()
 
 	if *createConfig {
@@ -48,6 +49,13 @@ func Serve() {
 			os.Exit(1)
 		}
 		os.Exit(0)
+	} else if *doConfig {
+		err := config.Configure()
+		if err != nil {
+			log.Error("Unable to configure: %v", err)
+			os.Exit(1)
+		}
+		os.Exit(0)
 	}
 
 	log.Info("Initializing...")