Fix assmbly for mvn clean install -Papache-release and update version to SNAPSHOT for SNAPSHOT release.

Trace segment compute by http json stream test success.

Provide new stage of module initialization. Named `notifyAfterCompleted`. And rename `init` stage to `start`. Now the initialization sequence is prepare -> start -> notifyAfterCompleted

1. Success: send to analytic worker
2. Failure: write into file.

because of remove the collection item action inside of collection for each action.

The commit code in ClusterZKDataMonitor's 'process' method,fixed the collector online/offline bug. By 'client.getChildren\(event.getPath\(\), true\);', collector can't get the deleted node. In fact,ClusterZKDataMonitor listening zookeeper 'onNodeChanged' event by use 'if \(listeners.containsKey\(event.getPath\(\)\)\)'.