OAK-960 Enable session refresh state coordination between multiple session in single thread
Slice RefreshManager into a composite of RefreshStrategy

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/oak/trunk@1519422 13f79535-47bb-0310-9956-ffa450edef68
OAK-659 Move purge logic for transient changes below the NodeBuilder interface
This initial fix still keeps transient changes from commit hooks in memory when running with a MicroKernel. See TODOs in org.apache.jackrabbit.oak.kernel.KernelNodeState.builder.
OAK-659 Move purge logic for transient changes below the NodeBuilder interface
- Keep merge locking local to KernelNodeStore
OAK-659 Move purge logic for transient changes below the NodeBuilder interface
- Implement rebase, merge, branch in SegmentNodeStoreService
OAK-659 Move purge logic for transient changes below the NodeBuilder interface
Synchronize SegmentNodeStore.merge in order to prevent conflicts on concurrent merge operations
OAK-659 Move purge logic for transient changes below the NodeBuilder interface
Remove fixme