[WIP] hsr-outputs.rb: use xrandr gem to get proper list of outputs with names #34
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Xinerama doesn't seem to be able to return an output name.
libxrandr didn't seem to return nonzero values,
adding a ruby version of hsr-outputs, that outputs name, x, y, width, height
(this does not yet address the Xinerama logic in hsetroot.c)