cleanup work
Merge branch 'master' of github.com:jpmossin/sonosCtrl

Conflicts:
	src/main/scala/sonosctrl/mediaservices/QueueActor.scala
	src/main/scala/sonosctrl/util/DeviceSubscriber.scala
Added SonosCtrlSystem trait
Started implementing actor for avt service
Handling of avt play, pause, next, prev requests
AVT Seek action support