Upgrading client dependancies. Upgrading to babel 6. Moving to es6 package system.

web/react/components/user_settings/user_settings_developer.jsx

@@ -1,8 +1,8 @@
 // Copyright (c) 2015 Mattermost, Inc. All Rights Reserved.
 // See License.txt for license information.
 
-var SettingItemMin = require('../setting_item_min.jsx');
-var SettingItemMax = require('../setting_item_max.jsx');
+import SettingItemMin from '../setting_item_min.jsx';
+import SettingItemMax from '../setting_item_max.jsx';
 
 export default class DeveloperTab extends React.Component {
     constructor(props) {