Issue #3 - use the temp queue name as reply-to rather than a binding key

https://github.com/tleyden/open-ocr/issues/3#issuecomment-44836123
Issue #3 -  fix a connection leak whenever the RPC client request times out because workers don't respond fast enough.

https://github.com/tleyden/open-ocr/issues/3#issuecomment-45108240