Gem

Hey, I turned this into a gem so it can be used in ```config/initializers/rabbitmq.rb``` like so

```ruby

QueueLibrary = Rails.env.test? ? BunnyMock : Bunny

$q = QueueLibrary.new

#
#
```

Sending you a pull request because since you did all the hard work you should own the gem. Please edit the author names as you see fit.

cheers
Sid