changed to Presents and Party changed to Crowd. Whee!
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@431 542714f4-19e9-0310-aa3c-eee0fc999fb1
make handling just one or two of the callbacks for those interfaces
simpler.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@305 542714f4-19e9-0310-aa3c-eee0fc999fb1