Merge pull request #82 from gjohnson/master

Add an explicit require for set
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Bunny 1.1.2+
Nack on exception
Merge pull request #84 from gjohnson/nack-on-exception

Nack on exception
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0.8.0
Back to dev version
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Bunny 1.1.3+

[Lower latency](https://github.com/ruby-amqp/bunny/pull/187), you see.
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Test against Ruby 2.1