- Replaced the asyncReplication property in the ReplicationService with a minimumReplicas properties. When set to 0, async replication will be in effect.
- Also removed the use of a map to track replication requests since at most, only 1 sync requrest is issued at a time.
git-svn-id: https://svn.apache.org/repos/asf/activemq/trunk@720234 13f79535-47bb-0310-9956-ffa450edef68