added sendToAll on Subscriptions that allows a SessionFilter object to be used to filter the list.

Subscription.h

@@ -33,6 +33,7 @@ namespace core
       bool subInvite(TCPSession &session);
 
       void sendToAll(std::stringstream &data, TCPSession &sender);
+      void sendToAll(std::stringstream &data, TCPSession &sender, SessionFilter filter);
 
       std::string id;
       std::string mode;