Devices are turned off before being turned on.

Previously, the command being ran was on the form `xrandr --output HDMI1
--mode 1280x1024 --output VGA1 --off`. However, this lead to a bug on some
machines were only a limited number of devices could be turned on at the same
time.  The same configuration is now created with a command on the form
`xrandr --output VGA1 --off && xrandr --output HDMI1 --mode 1280x1024`.
Bump version.