Add createMessageExchanges to Scope.

tools.descartes.prisma.core/src/tools/descartes/prisma/core/scopes/Scope.java

@@ -53,6 +53,10 @@ public abstract class Scope {
 			
 			try {
 				transaction.commit();
+				// No initialize the message exchanges in the messaging
+				// subsystem through which the coordination message are
+				// transferred.
+				createMessageExchanges();
 				return true;
 			} catch (CommitException e) {
 				e.printStackTrace();
@@ -74,4 +78,8 @@ public abstract class Scope {
 	protected abstract void createResources(Transaction transaction);
 
 	protected abstract String getBasePath();
+
+	protected void createMessageExchanges() {
+		// Do nothing;
+	}
 }