ui: implement new 'tile' view for set > featured items

Squashed commit of the following:

commit dd4d8a8bb8c42997b96efa24bad5437949c538c9
Author: Max F. Albrecht <1@178.is>
Date:   Fri Aug 15 18:01:02 2014 +0200

    add markup for tile view in set > featured items

commit 6b1c66511bce4fe349795f5db0eff2879647cbc2
Author: Max F. Albrecht <1@178.is>
Date:   Fri Aug 15 17:22:19 2014 +0200

    refactor partial 'privacy' (don't wrap in special class)

commit 1daa5204368140a36a484ce7b2e7aa1cde8bd52c
Author: Max F. Albrecht <1@178.is>
Date:   Fri Aug 15 15:51:49 2014 +0200

    styleguide: use new tiles markup in featured items