custom channels to subscribe to

[sergeyglazyrindev]

Hey guys. I need to be able to subscribe to simple websockets channels being anonymous on the site. Since websocket channel its only redis-channel and most important redis commands being used are commands related to publish/subscribe stuff in redis ( https://redis.io/commands#pubsub ) I can provide a changeset with these changes. So, please let me know if you would consider to merge these changes if I prepare this changeset.