Updated gtk/gtk3

  * settings.ini: removed spurious line 'gtk-icon-theme'.

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>
Added 2 files to awesome

  * run-once{,-pure}.lua: 2 sample file to use with awesome, run a
    programm only once.

Signed-off-by: Vladimir Lomov <lomov.vl@gmail.com>