Issue #1969088 by itamar, amitaibu: Changes to group browsing widget & user status updates.
Issue #1948224 by itamar: Added Expose a 'Request membership' link for groups with private content where the group is public.
Issue #1984824 by itamar: Fixed Anonymous users are able to create group content.
Merge branch '7.x-3.x' into trusted_contacts