config: hub.port is optional, allow putting full URL in hub.address field

Config.go

@@ -17,7 +17,7 @@ type Config struct {
 
 	Hub struct {
 		Address string `json:"address"`
-		Port    int    `json:"port"`
+		Port    int    `json:"port,omitempty"`
 		Tag     string `json:"tag"`
 	}
 }

main.go

@@ -48,8 +48,13 @@ func (this *App) HubWorker(Nick, Pass string, so socketio.Socket, done chan stru
 	selfUser.ClientTag = this.cfg.Hub.Tag
 	selfUser.ClientVersion = libnmdc.DEFAULT_CLIENT_VERSION
 
+	url := this.cfg.Hub.Address
+	if this.cfg.Hub.Port == 0 {
+		url = fmt.Sprintf("%s:%d", this.cfg.Hub.Address, this.cfg.Hub.Port)
+	}
+
 	hco := libnmdc.HubConnectionOptions{
-		Address:      libnmdc.HubAddress(fmt.Sprintf("%s:%d", this.cfg.Hub.Address, this.cfg.Hub.Port)),
+		Address:      libnmdc.HubAddress(url),
 		Self:         selfUser,
 		NickPassword: Pass,
 	}