Embedded database

[kamicut]

Should we move to an embedded DB like LevelDB? It might make install and adoption simpler without needing to install redis. Another option would be to go the docker route and distribute a docker-compose file that spins up redis and Node.

cc @matthewhanson

[kamicut]

Chatting with @anandthakker I think one way would be to start with docker-compose, and then make embedded kv store a longer term goal.