PLT-2241 Refactored statuses into a more real-time system (#3573)

* Refactored statuses into a more real-time system

* Updated package.json with correct commit and fixed minor bug

* Minor updates to statuses based on feedback

* When setting status online, update only LastActivityAt if status already exists

webapp/components/sidebar.jsx

@@ -125,7 +125,7 @@ export default class Sidebar extends React.Component {
 
             directChannel.display_name = Utils.displayUsername(teammateId);
             directChannel.teammate_id = teammateId;
-            directChannel.status = UserStore.getStatus(teammateId);
+            directChannel.status = UserStore.getStatus(teammateId) || 'offline';
 
             if (UserStore.hasTeamProfile(teammateId)) {
                 directChannels.push(directChannel);