chore: Upgrade Babel, Jest, Eslint (#1437)

* chore: Upgrade Prettier 1.8 -> 2.0

* chore: Upgrade Babel 6 -> 7

* chore: Upgrade eslint plugins

* chore: Add eslint import/order rules

* chore: Update flow-typed deps

server/test/factories.js

@@ -1,4 +1,5 @@
 // @flow
+import uuid from "uuid";
 import {
   Share,
   Team,
@@ -10,7 +11,6 @@ import {
   GroupUser,
   Attachment,
 } from "../models";
-import uuid from "uuid";
 
 let count = 0;