Adds the ability to filter your data down. This is useful when your items fall in to a number of discrete buckets, like zip code or city and you want to be able to narrow your results.
Test coverage for filtering
Adapted loader to add filterable fields to redis
Code for filtering results
Added docs about filtering
Add filtering support to the server
Remove a bit of fail
I just took a look at this, I think it's probably good. I just want to think about it for a bit and try to figure out a way to do this w/o creating so many extra sorted sets