(+) onInfo, onNotification

Please notice that I can’t test in real situation. But I tested with
static strings, so it should work.

(+) handle onInfoReceived
(/=) parse manually (sic) the notification user joined / left
(/=) replace string constants of getVectorClock
Merge branch 'master' of https://github.com/glukas/DistributedSystemsProjects