[modules/layout-xkb] Parameter to show full layout name
[modules/layout-xkb] Parameter to show full layout name

If parameter "showname" is specified, do not show the symbol (e.g.
"us"), but the full layout name (e.g. "English (US)").

see #177

tobi-wan-kenobi/bumblebee-status,tobi-wan-kenobi/bumblebee-status