This makes the scroll and only_on_screen widgets appear in the widget
lists. The examples are not really helpful, but Elv13 told me to add
them. Also, only_on_screen is in awful.widget, but now something in
tests/examples/wibox/container refers to it...
Signed-off-by: Uli Schlachter <psychon@znc.in>
Uli Schlachter