Screenly OSE Disk Image steps

Download the latest Rasbian Stretch Lite
Flash out the disk image to a 4GB SD card
Boot the system
Run raspi-config and:
- Set the keyboard to locale to en_US.UTF-8 UTF-8
Run the installer and install the production branch
Verify that everything works
Run sudo ./bin/prepare_device_for_imaging.sh
Shut down the system
Create the disk image by running SD_DEV=/dev/sdc sudo -E ./bin/create_screenly_ose_build.sh on a Linux machine (where /dev/sdc is your SD card)