Remove TopicChangeListener. Add Topic to topic events.
Merge pull request #288 from csmith/master

Remove random unused, confusing Profile thing.
Merge pull request #287 from greboid/events

Remove TopicChangeListener. Add Topic to topic events.
Use GroupChatUser some more.
Merge pull request #289 from greboid/events

Use GroupChatUser some more.
Small changes to GroupChat/Connection interfaces.