Node 8 (WIP) (#9946)

* start upgrade to node 8

* upgrade travis

* improve travis

* Remove bluebird, babel (except for modules) from server (WIP) (#9947)

* remove bluebird, babel from server (except for modules)

* fixes

* fix path

* fix path

* fix export

* fix export

* fix test

* fix tests

* remove plugin for transform-object-rest-spread since it is supported in node8

* babel: correct syntax rest spread

* remove bluebird

* update migrations archive readme

* fix package-lock.json

* fix typo

* add package-loc

migrations/groups/update-groups-with-group-plans.js

@@ -9,8 +9,6 @@ let authorUuid = ''; // ... own data is done
  * subscription to all members
  */
 
-import Bluebird from 'bluebird';
-
 import { model as Group } from '../../website/server/models/group';
 import * as payments from '../../website/server/libs/payments';
 
@@ -28,7 +26,7 @@ async function updateGroupsWithGroupPlans () {
   });
 
   cursor.on('close', async () => {
-    return await Bluebird.all(promises);
+    return await Promise.all(promises);
   });
 }