Adding webpack code splitting (#3377)

webapp/components/admin_console/admin_navbar_dropdown.jsx

@@ -10,7 +10,7 @@ import * as GlobalActions from 'actions/global_actions.jsx';
 
 import {FormattedMessage} from 'react-intl';
 
-import {Link} from 'react-router';
+import {Link} from 'react-router/es6';
 
 import React from 'react';
 

webapp/components/admin_console/admin_sidebar.jsx

@@ -11,7 +11,7 @@ import * as Utils from 'utils/utils.jsx';
 import AdminSidebarHeader from './admin_sidebar_header.jsx';
 import AdminSidebarTeam from './admin_sidebar_team.jsx';
 import {FormattedMessage} from 'react-intl';
-import {browserHistory} from 'react-router';
+import {browserHistory} from 'react-router/es6';
 import {OverlayTrigger, Tooltip} from 'react-bootstrap';
 import SelectTeamModal from './select_team_modal.jsx';
 import AdminSidebarCategory from './admin_sidebar_category.jsx';

webapp/components/admin_console/admin_sidebar_category.jsx

@@ -3,7 +3,7 @@
 
 import React from 'react';
 
-import {Link} from 'react-router';
+import {Link} from 'react-router/es6';
 
 export default class AdminSidebarCategory extends React.Component {
     static get propTypes() {

webapp/components/admin_console/admin_sidebar_section.jsx

@@ -3,7 +3,7 @@
 
 import React from 'react';
 
-import {Link} from 'react-router';
+import {Link} from 'react-router/es6';
 
 export default class AdminSidebarSection extends React.Component {
     static get propTypes() {

webapp/components/admin_console/user_item.jsx

@@ -10,7 +10,7 @@ import TeamStore from 'stores/team_store.jsx';
 import {FormattedMessage, FormattedHTMLMessage} from 'react-intl';
 
 import React from 'react';
-import {browserHistory} from 'react-router';
+import {browserHistory} from 'react-router/es6';
 
 export default class UserItem extends React.Component {
     constructor(props) {