Use groupcache as a local (dev) alternative to Redis/Memcached

[soygul]

https://github.com/golang/groupcache

Since groupcache does not require separate cache cluster, it is perfect match for local development environments.

[soygul]

https://github.com/coreos/etcd

This is a real distributed (and embeddable) in-mem key/value store which is perfect for our task. Probably on par with Redis approach.

There are other similar distributed key/value store libraries out there worth evaluating too.

[soygul]

Actually we can use any Distributed hash table implementation for our purposes since what we need is very basic.