Merge redis changes

The upstream repo for this fork has changed to use redis. No changes need to be made on gThrive's end, but merge this change in when possible to keep in sync with what's deployed to config-master-gthrive.herokuapp.com
This line is the only line ('custom generated for app2997...') that gives me pause. @wstrinz : happy to merge this, but please look at this comment of mine and just make sure that this is what we want here.