Update XMPP CLient and add node discovery
Merge branch 'master' of github.com:ocean90/wba2-serientracker

Conflicts:
	SerienTracker/src/de/fhkoeln/gm/serientracker/client/gui/HomeGUI.java
	SerienTracker/src/de/fhkoeln/gm/serientracker/client/gui/MySerieGUI.java