Sage-Bionetworks/Synapse-Repository-Services — pull request #877 by kaysoky (2013-12-03 20:16:45+00:00)
Title: Factor out TagMessenger and EtagGenerator and (deprecated) CRUD from backup

The TagMessenger acts as a middle man that performs both etag changes and the sending of change messages. That functionality is overloaded and should be separate.
See: https://sagebionetworks.jira.com/browse/PLFM-2364

Since the EtagGenerator is tied closely with the TagMessenger, it is being removed along side this change
See: https://sagebionetworks.jira.com/browse/PLFM-2366

Also, many instances where these two classes are used lie within deprecated methods from V2 migration. So those are being removed too.