Initial script.
Initial version.

quassel-notify-listener.py monitors the dbus session bus for quassel
notifications and invokes blink-thinklight.py helper.

blink-thinklight.py helper blinks the thinkpad light. The helper
is mostly needed because /proc/acpi/ibm/light is only writeable by root.
Adjust quassel-notify-listener.py to python-3.
Refactor code that controls the ThinkLight.

Removed need for external helper script. quassel-blink now checks for
and sets the correct permissions on /proc/acpi/ibm/light itself.