[BACKLOG-248] Write extension point plugin producing guava bus events
	- created kettle-monitoring-plugin as the first step ( read: entry-point ) to PDI monitoring story
	- uses PDI Extension Point Plugins mechanism ( see http://wiki.pentaho.com/display/EAI/PDI+Extension+Point+Plugins )	- uses event bus plugin work @ https://github.com/pentaho/pentaho-platform/tree/monitoring
	- when the PDI Extension Point Plugins mechanism is triggered at a specific event, an Event object is built and posted to the eventbus, where an EventSubscriber for this type of event has been previously subscribed
Merge pull request #679 from pedrofvteixeira/monitoring

[BACKLOG-248] Write extension point plugin producing guava bus events
[BACKLOG-251]-Updating the properties files for the monitoring branch
Merge pull request #685 from rmansoor/monitoring

[BACKLOG-251]-Updating the properties files for the monitoring branch
[BACKLOG-248] Write extension point plugin producing guava bus events
	- added 2 new attributes to JobEvent and TransformationEvent: startTimeMillis , endTimeMillis
	- startTimeMillis is set with the currentDate.getTime() of the given job/transformation, and endTimeMillis is set upon the triggering of the 'JobFinish' / 'TransformationFinish' PDI Extension point listeners
	- added 3 more PDI Extension point listeners to the monitoring plugin: JobFinishMonitor, TransformationFinishMonitor, TransformationStartMonitor
Merge pull request #686 from pedrofvteixeira/monitoring

[BACKLOG-248] Write extension point plugin producing guava bus events
[BACKLOG-251] - Updating plugin list with kettle-monitoring-plugin
Merge pull request #687 from rmansoor/monitoring

[BACKLOG-251] - Updating plugin list with kettle-monitoring-plugin
[BACKLOG-248][CLEANUP]
	- logging is better organized;
	- also added additional logging, covering more of the code
	- fixed javadoc tag ( from "@see <link>" to "@link <link>" )
Merge pull request #688 from pedrofvteixeira/monitoring

[BACKLOG-248][CLEANUP]
Merge branch 'monitoring' of https://github.com/pentaho/pentaho-kettle