[packaging] Add PKGBUILD for AUR building
[packaging] Add PKGBUILD for AUR building

AUR package for released versions of bumblebee-status should now be
available here: https://aur.archlinux.org/packages/bumblebee-status/

fixes #172

tobi-wan-kenobi/bumblebee-status,tobi-wan-kenobi/bumblebee-status