Removes waiting guests that stop polling for their status

...rc/main/scala/org/bigbluebutton/core/apps/GuestsApp.scala

...in/scala/org/bigbluebutton/core/apps/users/UsersApp.scala

...ton/core/pubsub/senders/ReceivedJsonMsgHandlerActor.scala

...n/scala/org/bigbluebutton/core/running/MeetingActor.scala

...c/main/scala/org/bigbluebutton/core2/AnalyticsActor.scala

...re2/message/handlers/guests/GuestWaitingLeftMsgHdlr.scala

.../org/bigbluebutton/core2/message/senders/MsgBuilder.scala

...ain/scala/org/bigbluebutton/common2/msgs/GuestsMsgs.scala

...b/src/main/java/org/bigbluebutton/api/MeetingService.java

...b/src/main/java/org/bigbluebutton/api/domain/Meeting.java

...ain/java/org/bigbluebutton/api/domain/RegisteredUser.java

...src/main/java/org/bigbluebutton/api2/IBbbWebApiGWApp.java

...bluebutton/web/services/WaitingGuestCleanupTimerTask.java

...rc/main/scala/org/bigbluebutton/api2/BbbWebApiGWApp.scala

...eb/src/main/scala/org/bigbluebutton/api2/MsgBuilder.scala

...ton-html5/imports/api/guest-users/server/eventHandlers.js

...ports/api/guest-users/server/handlers/guestWaitingLeft.js

...5/imports/api/guest-users/server/modifiers/removeGuest.js

bigbluebutton-web/grails-app/conf/spring/resources.xml

...rs/org/bigbluebutton/web/controllers/ApiController.groovy