Websocket Support (#937)

* Atom / RSS meta link

* Spike

* Feeling good about this spike now

* Remove document.collection

* Remove koa.ctx from all presenters to make them portable outside requests

* Remove full serialized model from events
Move events.add to controllers for now, will eventually be in commands

* collections.create event
parentDocument -> parentDocumentId

* Fix up deprecated tests

* Fixed: Doc creation

* documents.move

* Handle collection deleted

* 💚

* Authorize room join requests

* Move starred data structure
Account for documents with no context on sockets

* Add socket.io-redis

* Add WEBSOCKETS_ENABLED env variable to disable websockets entirely for self hosted
New installations will default to true, existing installations to false

* 💚 No need for promise response here

* Reload notice

server/presenters/user.js

@@ -14,11 +14,7 @@ type UserPresentation = {
   isSuspended: boolean,
 };
 
-export default (
-  ctx: Object,
-  user: User,
-  options: Options = {}
-): ?UserPresentation => {
+export default (user: User, options: Options = {}): ?UserPresentation => {
   const userData = {};
   userData.id = user.id;
   userData.createdAt = user.createdAt;