Add publish command.
Add pubsub_channels command.
Add pubsub_numsub command.
Add ROLE
Report lock name when locking fails.
Filter out section headers from INFO queries.

Section headers do not follow the key:value syntax, so
splitting on these lines raises a Not_found exception.
Add a stream data type for use with SUBSCRIBE.
Add subscribe command.
Add unsubscribe command.
Add zadd command.
Add zrange command.
Add zrem command.
Add zrangebyscore command.
Add script_load command.
Add evalsha command.
Add eval command.