[BISERVER-11504] Making the Activator resilient to restarting
[BACKLOG-218] Add event bus to the platform and make sure it is available on the DI Server
	- implemented async event bus leveraging on google-guava's
	- subscribers and events are wrapped in top level interfaces IMonitoringEvent and IMonitoringSubscriber
	- created a 'shell/skeleton' plugin whose only function is to startup MonitoringService
[BACKLOG-252] - Updating test properties for branched projects
[BACKLOG-252] - Updating test properties for branched projects
[BACKLOG-252] - Setting the project revision to MONITORING-SNAPSHOT
[BACKLOG-394] Registering EventBus with the system
[BACKLOG-218] Add event bus to the platform and make sure it is available on the DI Server
	- added unit tests
Merge branch 'monitoring' of https://github.com/pentaho/pentaho-platform into monitoring

# By Ramaiz Mansoor (3) and others
# Via Nick Baker
* 'monitoring' of https://github.com/pentaho/pentaho-platform:
  [BACKLOG-218] Add event bus to the platform and make sure it is available on the DI Server 	- added unit tests
  [BACKLOG-394] Registering EventBus with the system
  [BACKLOG-252] - Setting the project revision to MONITORING-SNAPSHOT
  [BACKLOG-252] - Updating test properties for branched projects
  [BACKLOG-252] - Updating test properties for branched projects
  [BACKLOG-218] Add event bus to the platform and make sure it is available on the DI Server 	- implemented async event bus leveraging on google-guava's 	- subscribers and events are wrapped in top level interfaces IMonitoringEvent and IMonitoringSubscriber 	- created a 'shell/skeleton' plugin whose only function is to startup MonitoringService
  [BISERVER-11504] Making the Activator resilient to restarting