Revert "Do those imports!"

This reverts commit 64dcc70bd2.

models/activities.js

@@ -1,5 +1,3 @@
-import Attachments from './attachments';
-
 // Activities don't need a schema because they are always set from the a trusted
 // environment - the server - and there is no risk that a user change the logic
 // we use with this collection. Moreover using a schema for this collection

models/boards.js

@@ -6,7 +6,6 @@ import {
   TYPE_TEMPLATE_CONTAINER,
 } from '/config/const';
 import Users from "./users";
-import Attachments from './attachments';
 
 const escapeForRegex = require('escape-string-regexp');
 

models/cards.js

@@ -4,7 +4,6 @@ import {
   TYPE_LINKED_BOARD,
   TYPE_LINKED_CARD,
 } from '../config/const';
-import Attachments from './attachments';
 
 Cards = new Mongo.Collection('cards');
 

models/exporter.js

@@ -1,5 +1,4 @@
 const Papa = require('papaparse');
-import Attachments from './attachments';
 
 //const stringify = require('csv-stringify');