Added logging with a specific logging only configuration. Allows
	us to enforce a central logging location and still use
	multiple yaml files for syncing.
Added ability to remove head and tags not available in upstream.
Added ability to prevent specific heads and tags from being
	pruned when syncing with upstream.
Added ability to sync only a specific project and skip users,
	groups, and other projects. This is useful when noticing
	a change on upstream.
gerrit-setup has been renamed to gerrit-sync.
Most of the logic in gerrit-sync has been moved into modules.
	gerrit-sync is now little more than argparse.