remove underscores from member field names
more underscore removal
Refactor
Make DuplicateQueueingConsumerException's javadoc more accurate
DuplicateQueueingConsumerException => MultipleQueueingConsumersException
Refactor MultipleQueueingConsumersException

Improve the exception message and use 'initial' and 'received' to
describe the consumer tags in question, both in the message and
in member fields and accessors
Improve the illegal state exception message for QueueingConsumer#handleDevliery
DuplicateQueueingConsumerTests => MultipleQueueingConsumerTests
cosmetic (vertical alignment)
Refactor QosTests to accomodate changes to QueueingConsumer