lets use separate steps for adding a APT key using "apt-key add" so that wget download errors are revealed correctly.
lets use separate steps for adding a APT key using "apt-key add" so that
wget download errors are revealed correctly.

jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic,jens-maus/RaspberryMatic