Use a valve to stop media flow when no pads are connected
Use a valve to stop media flow when no pads are connected

Issue: #109
Change-Id: I69ca0efb762b7c8ea13df58aa0c496ba665b593f

shelsonjava/kms-elements,TribeMedia/kms-elements,TribeMedia/kms-elements,shelsonjava/kms-elements,shelsonjava/kms-elements,TribeMedia/kms-elements,Kurento/kms-elements,Kurento/kms-elements,Kurento/kms-elements