Reply queue should not require acknowledgement.

Unless I have misunderstood something - I think the call to BasicConsume for the reply queue should pass 'true' instead of 'false' for the 'noAck' parameter - as the callback messages are not acknowledged. Otherwise this leaves unacknowledged messages in the queue.
Merge pull request #17 from liddellj/master

Reply queue should not require acknowledgement in dotnet tutorial 6.