Post to Slack (#603)

* Migrations

* WIP: Integration model, slack perms / hooks

* So so rough it pains me. Building this new model is revealing just how much needs to be refactored

* Working connect and post

* Cleanup UI, upating documents

* Show when slack command is connected

* stash

* 💚

* Add documents.update trigger

* Authorization, tidying

* Fixed integration policy

* pick integration presenter keys

server/presenters/integration.js

@@ -0,0 +1,20 @@
+// @flow
+import { Integration } from '../models';
+
+function present(ctx: Object, integration: Integration) {
+  return {
+    id: integration.id,
+    type: integration.type,
+    userId: integration.userId,
+    teamId: integration.teamId,
+    serviceId: integration.serviceId,
+    collectionId: integration.collectionId,
+    authenticationId: integration.authenticationId,
+    events: integration.events,
+    settings: integration.settings,
+    createdAt: integration.createdAt,
+    updatedAt: integration.updatedAt,
+  };
+}
+
+export default present;