Attachment support
Fix issues in datastore layer
Datastore bug fixes
Fix for event put_event failure with id
Enhance list_queues to take optional column filtering
Make agents stateful.
Merge pull request #300 from shenrie/master

Enhance list_queues to take optional column filtering
Added availability_transitions to extended resource container
Added availability_transitions to extended resource container
Merge branch 'master' into postgres

Conflicts:
	extern/ion-definitions
Fixed datastore issues and tests
Pyon integration tests pass
Protected against import