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/policies/collection.js

@@ -9,7 +9,7 @@ allow(User, 'create', Collection);
 
 allow(
   User,
-  ['read', 'publish', 'update'],
+  ['read', 'publish', 'update', 'export'],
   Collection,
   (user, collection) => collection && user.teamId === collection.teamId
 );

server/policies/team.js

@@ -7,7 +7,7 @@ const { allow } = policy;
 
 allow(User, 'read', Team, (user, team) => team && user.teamId === team.id);
 
-allow(User, 'update', Team, (user, team) => {
+allow(User, ['update', 'export'], Team, (user, team) => {
   if (!team || user.teamId !== team.id) return false;
   if (user.isAdmin) return true;
   throw new AdminRequiredError();