screenkey 0.6

- The ``python-xlib`` module and the ``xmodmap`` executable are not
  required/used anymore. screenkey now uses ``libX11.so.6`` directly.
- Key composition/input method support.
- A new setting (always show Shift) has been added to always add "Shift" in
  modifier sequences which contain capitalizable letters.
- CapsLock and NumLock status (on/off) is now shown when pressed.