renamed BOARD= variable to PRODUCT to be able to derive BOARD= automatically for generating the release archives.
renamed BOARD= variable to PRODUCT to be able to derive BOARD= automatically for generating the release archives.

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