
This enables more declarative delivery of documents from multiple owners. - Updates design document: - Removes Tombstone concept from the API. - Adds and descritbes Bucket concept. - Removes planned DELETE endpoints. - Adds "purge" endpoint to simplify functional testing. - Adds functional tests for document crud using buckets. Change-Id: I7987deb417d34fbd80b888e41e52fabaf330d544