OAK-1332: Large number of changes to the same node can fill observation queue

Simplify QueueingHandler now that much of the extra functionality is in separate classes.

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1562850 13f79535-47bb-0310-9956-ffa450edef68
OAK-1309: TarMK master-slave clustering

Basic SegmentStore implementation based on the recently added HTTP interface

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1562852 13f79535-47bb-0310-9956-ffa450edef68