Promise based WebSockets

[baransu]

Right now WebSockets are very primitive. Converting it to promise based approach allow us sending promise based messages to server.

socket.send('topic', { message })
  .then(response => {})
  .catch(error => {})

We have to put some work into restoring lost connection as well because maybe we're using erlangpl on separate machine within the same network and we lost connection, etc.