elixir: bump to version v0.13.2
rpi_qt5: add config supporting qt5 and webkit

This also bumps the rootfs max size to 128 MB like specified in
fwtool.config in the comments.
new package: blstrobe

This utility communicates with BenQ monitors via the DDC bus to control
backlight flicker timing.
Pull in latest buildroot, bump RPi kernel
erlinit: bump to v0.3.0
Launch dtach for qt5 so that termin can be in gui
nerves.mk: alternative to sourcing nerves-env.sh

For Nerves configurations that pull in Nerves as a subdirectory to the
project, this file can be included in a Makefile to achieve similar
results as sourcing nerves-env.sh.