updates for rabbit 3.3.0

* changed the default basicQos.global to true, rabbitmq changed what this means in version 3.3
* switch to consumer cancel for pause, and consumer for resume.  consumerFlow has been removed
fixed backwards compatibility with rabbitmq 3.3.0 qos changes
updated readme and version bump
Merge pull request #5 from dropbox/feature/rabbit3.3updates

Feature/rabbit3.3updates