- close jws app when sharing is cancelled (not started)

bbb-screenshare/app/jws/lib/javacv-screenshare-0.0.1.jar

...bluebutton/app/screenshare/StartShareRequestResponse.java

...rg/bigbluebutton/app/screenshare/red5/Red5AppHandler.java

...igbluebutton/app/screenshare/ScreenShareApplication.scala

...ebutton/app/screenshare/server/sessions/Screenshare.scala

...n/app/screenshare/server/sessions/messages/IMessage.scala

...utton/screenshare/client/net/NetworkHttpStreamSender.java

...ules/screenshare/events/ShareStartRequestResponseEvent.as

...button/modules/screenshare/managers/ScreenshareManager.as

...luebutton/modules/screenshare/services/MessageReceiver.as