Etsy FeatureAPI and Rollout Unite 

I worked at etsy for several years. Now that I'm back in a rails shop (CarWoo!) I started looking for an alternative to our "ServerConfig", which just got open sourced as "Feature API" https://github.com/etsy/feature

I have been in the process of porting / merging etsy's featureAPI into rollout. I like your redis based configuration it make a ton of sense. So I just added support for url overrides, variants and a few other useful items. I also added tighter integration into Rails, with helpers and rollout_context for accessing user objects, etc. Still a bit clunky, but we are rolling it into prod this week.

Let me know what you think, maybe a 3.0 version of rollout??