OAK-1133: Observation listener PLUS
MoveDetector now sends name of moved node instead of path. This allows simplifying EventIterator  and ChangeProcessor since they now don't need to keep track of the path

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1546566 13f79535-47bb-0310-9956-ffa450edef68