added program_usb_boot_mode=1 to config.txt so that a RaspberryPi3 is prepared to be bootable via USB/network. This refs #103 and refs #104.
added program_usb_boot_mode=1 to config.txt so that a RaspberryPi3 is prepared to be bootable via USB/network. This refs #103 and refs #104.

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