- change default meeting expiration to 1 minute
 - trigger ingest and processing when the meeting is removed form memory instead of when the last
   user leaves the meeting

Conflicts:
	bigbluebutton-client/src/BigBlueButton.mxml
	bigbluebutton-client/src/org/bigbluebutton/main/model/users/UsersSOService.as
	bigbluebutton-client/src/org/bigbluebutton/modules/chat/views/ChatWindow.mxml

 - merge guga's work to pre-load images when playing back recording

   it linger for about an hour (the value of the expire meeting).

   compatibility with previous release allwoing the demo meeting to run infinitely (for
   example). 3rd-party apps must pass duration if they want to set it, especially if the
   meeting is being recorded.

 - set the meeting to forciblyEnded if the end api has been called

Add open4 to Gemfile