- update loading screen with guest wait status

...s/flash/air-client/src/org/bigbluebutton/air/AppConfig.as

...h/air-client/src/org/bigbluebutton/air/main/MainConfig.as

.../bigbluebutton/air/main/commands/JoinMeetingCommandAIR.as

...g/bigbluebutton/air/main/services/GuestWaitPageService.as

...nt/src/org/bigbluebutton/air/main/services/JoinService.as

...org/bigbluebutton/lib/common/utils/GuestWaitURLFetcher.as