Added support for RefReplicated and RefReplicationDone events

Defined DTO objects for both events. These events allow to know when
the replication of a ref is completed to a specific node and to all
the nodes.

Change-Id: I6d25b21abcadc078ce9845756e39ab4235caddfa
Merge pull request #113 from hugares/replicationevents

Added support for RefReplicated and RefReplicationDone events