* Google Cloud Pubsub Module
The Google Cloud Pubsub module allows the Ansible user to:
* Create/Delete Topics
* Create/Delete Subscriptions
* Change subscription from pull to push (and configure endpoint)
* Publish messages to a topic
* Pull messages from a Subscription
An accessory module, gcpubsub_facts, has been added to list topics and subscriptions.
* Added docs for state field to DOCUMENTATION and RETURN blocks.
