Revision 382459

Patch for AMQ-606 to allow slow consumers to have their old messages discarded. For background to the issue see http://docs.codehaus.org/display/ACTIVEMQ/Slow+Consumers

Provides a way to set a limit on the pending messages to be dispatched to a subscription so that if that limit is reached, old messages are discarded. This will avoid the non-durable topics from getting blocked due to slow consumers