downcast every time we register an invocation service provider.
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@5201 542714f4-19e9-0310-aa3c-eee0fc999fb1
method invocation services and converted everything to the new style.
Could this be my biggest checkin ever?
git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1642 542714f4-19e9-0310-aa3c-eee0fc999fb1