Added project group list and detail view.

Reused several components from the existing list search, as well
as other parts from project views, to create a rudimentary list of
project groups. Also created a detail page that shows member
projects and stories, and lastly added a quicknav option into the
header quicknav.

Change-Id: Ie29dacb6c6fda47c0e59fa054da9c259a9a59797