messages that cannot be parsed into STOMP messages are now delegated to
a handler.  The default implementation logs the details at warning
level.
javadoc
don't log exceptions @ debug
added implementation for MINA exception caught, log to error level
doco
Cleaner error handling
more log detail
less log detail
package protected
sense more log make message
better logs
better error handling
Code cleanup, added exception to halt downstream processing of messages.
removed test code
doco
doco
Major code reorg:

1. Removed IoSession from message listener interface, now applicable for
all implementations.
2. Created client-server src folder for common CS classes
3. Pushed appropriate methods into super classes.
Further code reorg, client-server now contains the lion's share of CS
code.
Cleanup
Code reorg, common message listeners are now typed & abstract.