fix merge and refactor a few pieces to fit better on BigBlueButton 1.0.0

...n/java/org/bigbluebutton/core/api/IBigBlueButtonInGW.java

...on/core/pubsub/receivers/PresentationMessageListener.java

...ton/core/pubsub/receivers/SharedNotesMessageReceiver.java

...luebutton/core/pubsub/receivers/UsersMessageReceiver.java

...main/scala/org/bigbluebutton/core/BigBlueButtonInGW.scala

.../src/main/scala/org/bigbluebutton/core/MeetingActor.scala

.../src/main/scala/org/bigbluebutton/core/MeetingModel.scala

...ain/scala/org/bigbluebutton/core/MessageSenderActor.scala

...src/main/scala/org/bigbluebutton/core/api/Constants.scala

...rc/main/scala/org/bigbluebutton/core/api/InMessages.scala

.../main/scala/org/bigbluebutton/core/api/MessageNames.scala

...c/main/scala/org/bigbluebutton/core/api/OutMessages.scala

.../main/scala/org/bigbluebutton/core/api/ValueObjects.scala

...in/scala/org/bigbluebutton/core/apps/SharedNotesApp.scala

...src/main/scala/org/bigbluebutton/core/apps/UsersApp.scala

...c/main/scala/org/bigbluebutton/core/apps/UsersModel.scala

...re/pubsub/senders/PesentationMessageToJsonConverter.scala

...re/pubsub/senders/SharedNotesMessageToJsonConverter.scala

...ton/core/pubsub/senders/UsersMessageToJsonConverter.scala

bbb-api-demo/src/main/webapp/bbb_api.jsp