It turns out that in the mongo auto sync, there can be a *negative* number of records (not sure why, if the mysql db is supposed to be acid and up-to-date) so this fixes the regex expression accordingly; also documented the correct settings switch to use.
Merge pull request #1299 from SEL-Columbia/automate_mongo_sync-regex

It turns out that in the mongo auto sync, there can be a *negative* numb...