Add page: List feeds of certain group

Feeds are organized to groups. However there is no page to show feeds for certain group.

Also RSS/ATOM feed for such group would be very useful (it can replace aggregated feed like Aerogear agregate feed which combines all posts from Aerogear group (see http://planet.jboss.org/view/feed.seam?name=aergear_agg&from=0)