Add support for logs in StreamingToken (#1229)

* Add support for logs in StreamingToken

Tokens now end up looking like `s11_22|dl-0-123|ab-0-12224`
where `dl` and `ab` are log names, `0` is the partition and
`123` and `12224` are the offsets.

* Also test reserialisation

* s/|/./g so tokens url escape nicely

syncapi/consumers/clientapi.go

@@ -91,7 +91,7 @@ func (s *OutputClientDataConsumer) onMessage(msg *sarama.ConsumerMessage) error
 		}).Panicf("could not save account data")
 	}
 
-	s.notifier.OnNewEvent(nil, "", []string{string(msg.Key)}, types.NewStreamToken(pduPos, 0))
+	s.notifier.OnNewEvent(nil, "", []string{string(msg.Key)}, types.NewStreamToken(pduPos, 0, nil))
 
 	return nil
 }