jtbutcher

it now supports an optional argument SYSFS_PATH ``` usage: rpi-backlight [-h] [--get-brightness] [-b VALUE] [--get-power] [-p VALUE] [-d DURATION] [-B {raspberry-pi,tinker-board,tinker-board-2,microsoft-surface-rt}] [-V] [SYSFS_PATH] Get/set power and brightness of the official...