ebus-Plugin to connect ebusd

*plugin to connect to a local or remote ebusd-Daemon
*eBus is a communication protocol used by heating-manufacturer i.e.
Vaillant, Wolf, Kromschröder
*ebusd: http://cometvisu.de/wiki/index.php?title=Ebusd
Create Readme.md

becomes docu for plugin
Create README.md
Delete Readme.md
iCal Feature update
add special handling for degree-sign send-items
Merge branch 'develop' of https://github.com/mknx/smarthome into develop
Merge remote-tracking branch 'upstream/develop' into calendar

Conflicts:
	plugins/ical/__init__.py
corrected bug in ical
Bug fix if opt not used
add
Update README.md

nearly final documentation
adding smarthome.conf option loglevel with: debug, info, warning, error,
critical
Merge branch 'calendar' of https://github.com/J-N-K/smarthome into develop
merging pull request from JNK. THX
DS-name in rrtool only supports 19 signs

so we have to cut the DS-name, generated by item-name at 19 signs
Update README.md
Merge remote-tracking branch 'upstream/develop' into ebus
Merge remote-tracking branch 'upstream/ebus' into ebus
Complete rework