This is a quick hack to get a panel button to show the on screen keyboard since
it's hard to activate it from the status area on a touch display.

Installation:

Check out the extension:

     git clone git://honk.sigxcpu.org/git/gnome-shell-oskb-extension.git ~/.local/share/gnome-shell/extensions/OnScreenKeyboardButton@sigxcpu.org

Activate it:

     gsettings set org.gnome.shell enabled-extensions "['OnScreenKeyboardButton@sigxcpu.org']