Add a list of all notifications

Summary: Add a "View All Notifications" link and page.

Test Plan: Viewed all notifications

Reviewers: jungejason, vrana

Reviewed By: jungejason

CC: aran

Maniphest Tasks: T974

Differential Revision: https://secure.phabricator.com/D2780

src/applications/notification/controller/PhabricatorNotificationPanelController.php

@@ -48,6 +48,16 @@ final class PhabricatorNotificationPanelController
         '</div>';
     }
 
+    $content .=
+      '<div class="phabricator-notification view-all-notifications">'.
+        phutil_render_tag(
+          'a',
+          array(
+            'href' => '/notification/',
+          ),
+          'View All Notifications').
+      '</div>';
+
     $json = array(
       'content' => $content,
       'number'  => $num_unconsumed,