OAK-1540: Switch Jackrabbit dependency to 2.8-SNAPSHOT and back once we have JCR-3745 released
Adapt to changes in Backend introduced with JCR-3729

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1577243 13f79535-47bb-0310-9956-ffa450edef68
OAK-1539: Implement JackrabbitObservationManager
Initial implementation

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1577245 13f79535-47bb-0310-9956-ffa450edef68