Merge pull request #43 from daniel-murray/master

Issue #42

* Remove listener build in pluginend
* Issue #43 (duplicate)
Issues #4 and #42

* Rename Start/Stop plugin to Activate/Deactivate for clarity of purpose.
* Move AddCommandListener to Activate function.
* Change Activate/Deactivate to stock functions.
Bump version for development, tagged v2.5.0
Issue #4

* Remove unused stock GetClientsPlaying
* Bump version, tagged v2.5.1