Updated to 3.4.2 release

- Updated for the new release of RabbitMQ release 3.4.2
- Removed the Centos 5.10 from integration testing
- Updated the Gemfile for testing
Added change from @dggc

Pulled this from https://github.com/jjasghar/rabbitmq/pull/160
Updated to 3.4.2 release

- Updated for the new release of RabbitMQ release 3.4.2
- Removed the Centos 5.10 from integration testing
- Updated the Gemfile for testing
Added change from @dggc

Pulled this from https://github.com/jjasghar/rabbitmq/pull/160
Upadated version to 3.4.2
Merge branch 'release_3.4.2' of https://github.com/jjasghar/rabbitmq into release_3.4.2
Merge pull request #166 from jjasghar/release_3.4.2

Updated to 3.4.2 release