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

test/api/v3/unit/middlewares/language.test.js

@@ -8,7 +8,6 @@ import {
   attachTranslateFunction,
 } from '../../../../../website/server/middlewares/language';
 import common from '../../../../../website/common';
-import Bluebird from 'bluebird';
 import { model as User } from '../../../../../website/server/models/user';
 
 const i18n = common.i18n;
@@ -162,7 +161,7 @@ describe('language middleware', () => {
             return this;
           },
           exec () {
-            return Bluebird.resolve({
+            return Promise.resolve({
               preferences: {
                 language: 'it',
               },