Add AMQP relation conf and hooks
fix comma typo
use yaml syntax
add initial rabbit connection setup and trivial status test messages
add simplestreams-testing ppa to load simplestreams with status update support
Use simplestreams GlanceMirror progress API to get status updates
Handle missing rabbit config by making send_status_message a noop
Merge pull request #16 from mikemccracken/status-updates

Support for image sync progress status updates via rabbitmq