Changes

Implemented support for RELATIONSHIP_ADD and RELATIONSHIP_REMOVE.
Created FriendAdded, FriendRemoved, UserBlocked, UserUnblocked,
FriendRequestSent, (FR)Canceled, (FR)Received, and (FR)Ignored events.
Reordered the events checked in ListenerAdapter to make Messages checked
first for faster events for Messages.
 (commit: bc0b8ef)