Homematic: Introduced a check alife mechanism for handling connection
resets from CCU2
Homematic: Added SocketTimeout of 30sec to callback server. Part of CCU2
bugfixes...
Homematic: Refresh Connection every 5min. Thanks to Thorsten Gilfert for
his patch.
XMPP

- Add possibility to join a multi user chat
- Add new Action 'chatXMPP' to send messages to a multi user chat
Merge remote-tracking branch 'upstream/master' into workspace
Homematic: Improved startup procedure and connection checking to CCU.
Homematic: Class headers and logging / Exception handling improvements.
Homematic: Class headers and logging / Exception handling improvements.
Merge branch 'workspace' of github.com:thomasletsch/openhab into workspace
Homematic: Synchronization of callback handler creation and removal.
Homematic: Better active service handling
Merge pull request #677 from thomasletsch/workspace

Homematic: CCU2 Fixes, CCUx connection stability improvements - Thanks, Thomas!
Merge pull request #663 from itheiss/master

XMPP - added multi user chat feature and corresponding scripts and rules action