Merge pull request #483 from portertech/beta

[beta] beta version bump
[changelog] updated changelog w/ keepalive check fixes
Merge pull request #484 from portertech/changelog

[changelog] updated changelog w/ keepalive check fixes
[reconnect] improved unsubscribe & server rabbitmq connection reconnect
            - used before_reconnect queue callbacks to handle consumer clean up
Merge pull request #487 from portertech/reconnect

[reconnect] improved unsubscribe & server rabbitmq connection reconnect
[extension-stop] provide an extension stop hook, tread carefully
Merge pull request #486 from portertech/extension-stop

[extension-stop] provide an extension stop hook, tread carefully
[beta] beta version bump, updated changelog