Redis keys command should removed in favor of scan

[tim-friedrich]

Hi,

Nice gem btw.
I had a look at the source and found that you are using the redis keys command to get the keys that match a particular pattern.
The keys command is blocking and should only be used for debugging. Since it can block your whole database if it is large enough. https://redis.io/commands/keys

You should use scan each instead. It batches the requests to the database. http://www.rubydoc.info/github/redis/redis-rb/Redis%3Ascan_each

[mikeymicrophone]

I'm interested in this change, since I would like to use the browser in production. Maybe I can assist in implementing it