Make Notifications Realtime

Summary:
Adds the node.js Aphlict server, the flash Aphlict client, and some
supporting javascript. Built on top of - and requires - D2703 (which is still
in progress).  Will likely work with no modification on top of the final
version, though.

The node server is currently run with

   sudo node support/aphlict/server/aphlict_server.js

Test Plan: tested locally

Reviewers: epriestley

Reviewed By: epriestley

CC: allenjohnashton, keebuhm, aran, Korvin

Differential Revision: https://secure.phabricator.com/D2704

src/applications/notification/controller/PhabricatorNotificationPanelController.php

@@ -33,10 +33,18 @@ final class PhabricatorNotificationPanelController
     $builder = new PhabricatorNotificationBuilder($stories);
     $notifications_view = $builder->buildView();
 
+    $num_unconsumed = 0;
+    foreach ($stories as $story) {
+      if (!$story->getHasViewed()) {
+        $num_unconsumed++;
+      }
+    }
+
     $json = array(
       "content" => $stories ?
         $notifications_view->render() :
         "<b>You currently have no notifications<b>",
+      "number" => $num_unconsumed,
     );
 
     return id(new AphrontAjaxResponse())->setContent($json);