make it easier to enter tags

Created by: tstriker

right now you can't enter nor see the tags through the extension at all, so that's for one, but there is a demand for automated or at least auto-suggested sets of categories. not so sure about that path, but the requirement is a valid one so something could be done.

originals: https://bugzilla.gnome.org/show_bug.cgi?id=641243 https://bugzilla.gnome.org/show_bug.cgi?id=666782