Socket use sockets for responses

[chiengineer]

impliments pubsub for socket handling for joining a basic room:lobby can be tested via the commandline tool wsc https://github.com/raphael/wsc

connect via websocket:

$ wsc ws://localhost:4000/ws
Connected to ws://localhost:4000/ws
> room:lobby # connect to channel
> hello!
< hello!

broadcast to a channel via iex (or other process)

Phoenix.PubSub.broadcast(JsonSvc.Channels.Room, "room:lobby", "hey friends")

in socket appears as:

< hey friends

still need to write tests.

Phase 2 involves creating room tokens that will fetch/spawn workers to relay status of post requests