Fixed ordering of event timelime

refs https://github.com/TryGhost/Team/issues/469

We order the set of all events by created_at, but were not fetching the
individual events with the same order applies, this resulted in
incorrect results.

ghost/members-api/lib/repositories/event/index.js

@@ -95,6 +95,8 @@ module.exports = class EventRepository {
             options.limit = 10;
         }
 
+        options.order = 'created_at desc';
+
         const allEventPages = await Promise.all([
             this.getNewsletterSubscriptionEvents(options),
             this.getSubscriptionEvents(options),