Fix a bug in the EqualsBuilder usage in UserTuneElement. Properly
synchronize listeners using CopyOnWriteSet. Make methods and fields
static where sensible and possible. Make
disableUserTuneNotifications() public (why was it private?). And a few
other minor fixes.
This commit will enable user to communicate
information about music to which user is listening.
This feature is less of a requirement and more like fun to me.
An attempt at solving SMACK-257.
Incase you see any chances of improvement,
please let me know :)