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/routes.js

@@ -146,11 +146,12 @@ router.get('/', async ctx => {
   );
 });
 
-// Other
 router.get('/robots.txt', ctx => (ctx.body = robotsResponse(ctx)));
 
 // catch all for react app
-router.get('*', async ctx => {
+router.get('*', async (ctx, next) => {
+  if (ctx.request.path === '/realtime/') return next();
+
   await renderapp(ctx);
   if (!ctx.status) ctx.throw(new NotFoundError());
 });