Merge branch 'issue-257' into mconf-live0.7.5

...on-web/src/java/org/bigbluebutton/api/MeetingService.java

...-web/src/java/org/bigbluebutton/api/RecordingService.java

...c/java/org/bigbluebutton/api/messaging/MessageToJson.java

...a/org/bigbluebutton/api/messaging/MessagingConstants.java

...ava/org/bigbluebutton/api/messaging/MessagingService.java

...rg/bigbluebutton/api/messaging/RedisMessagingService.java

...messaging/converters/messages/DeleteRecordingMessage.java

...essaging/converters/messages/PublishRecordingMessage.java

...saging/converters/messages/UnpublishRecordingMessage.java