#88 Dead Letter Queue handling added for MDB

[Peter Antman]

Dead Letter Queue handling has been added to
JMSContainerInvoker. Messages that are resent a certain
number of times will be sent to Dead Letter Queue,
where they may later be fetched and checked. This is to
avoid JBoss to end in a tight and endles loop when a
message is not acked on and on due to a transaction
rollback.

The way it behaves is documented in
org.jboss.ejvb.plugins.jms.DLQHandler.