Make debugging messages easier

msgbus.go

@@ -79,6 +79,10 @@ func LoadMessage(data []byte) (m Message, err error) {
 	return
 }
 
+func (m Message) String() string {
+	return fmt.Sprintf("msg#%d@%d(%q)", m.ID, m.Created.Unix(), string(m.Payload))
+}
+
 func (m Message) Bytes() ([]byte, error) {
 	return msgpack.Marshal(m)
 }