Tidied up Redis implementation. First working draft.
Expire values after 7 days.

For now, we will go with a seven day limit for data, once it gets to
that age we will access it via postgres. We may want to change this
later but its a decent start for now. The web UI only shows the last 24
hours at the moment, nevermind the last dy or the last 7.
Remove the redis specific test base

Make every test flush redis.
Removed stray console.logs
Merge pull request #31 from d0ugal/redis-ts

Redis timeseries