v1.4.0

This release merges the PR by @inbarbarkai. They are one year-old, and I'm ashamed it took me this long to merge them. Because I'm now watching the repository, I should need less time to react in the future...
Once again thanks for his contribution.

• BUGFIX: #30. QueueDeclarePassive now throws if the queue does not exist. Similarly, ExchangeDeclarePassive throws if the exchange does not exist.
• FEATURE: #29. Support for the Alternate Exchange Feature.
• BUGFIX: #28. DefaultBasicConsumer.IsRunning property is now correctly returning true/false.