Roster updates from spectrum2 now get correctly updated so users can be in mutliple groups again,
some minor structural changes to sendroster and RemoteRosterInterceptor to be more efficient and clear

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@13405 b35dd754-fafc-0310-a699-88a17e54d16e