Bulk export (#684)

* First pass (working) collection export to zip

* Add export confirmation screen

* 👕

* Refactor

* Job for team export, move to tmp file, settings UI

* Export all collections job

* 👕

* Add specs

* Clarify UI

server/emails/index.js

@@ -2,7 +2,7 @@
 import Koa from 'koa';
 import Router from 'koa-router';
 import { NotFoundError } from '../errors';
-import { Mailer } from '../mailer';
+import Mailer from '../mailer';
 
 const emailPreviews = new Koa();
 const router = new Router();