Wrong parameters for RPC function init

According to the HomeMatic XML RPC specification, to unregister a server "interface_id" needs to be an empty string, not the URL. I currently don't have a CCU to test this. So please check, if the change works.
improves Classic UI compatibility of Firefox 15 and higher
Added some energy reading for Web Interface Queries (FritzOS < 6.0)
Added some energy reading for Web Interface Queries (FritzOS < 6.0) - removed TODOs
Added some energy reading for Web Interface Queries (FritzOS < 6.0) - final
Changed string comparisions accoring to style of openhab
Cleanup a bit - Removed some commented parts not used anymore.
Removed useless since comment.
Merge remote-tracking branch 'upstream/master' into TFNewDevices
Merge remote-tracking branch 'upstream/master' into TFNewDevices
Merge remote-tracking branch 'upstream/master'
Added -2 as valid priority level for Pushover messages. Pushovers API was updated 2014-05-27.
TinkerforgeBinding:  Bricklet SegementDisplay4x7
Nibe heat pump binding: Fixed issue after configuration update (close previous connection, before open new one).
Open energy monitor binding: Fixed issue after configuration update (close previous connection, before open new one).
Swegon ventilation binding: Fixed issue after configuration update (close previous connection, before open new one).
RFXCOM binding: Fixed issue after configuration update (close previous connection, before open new one).
Add extra reference for FGR221
Initial addition of zwave.me  ZME_WCD2
It is now possible to get logging entries of calimero (the i/o library used by the KNX binding) and handle them with slf4j/logback.