Merge branch 'dispatcher-dashboard-activities' into 'master'

Refactor dashboard activities path

See merge request gitlab-org/gitlab-ce!16361

app/assets/javascripts/dispatcher.js

@@ -340,7 +340,9 @@ import Activities from './activities';
           shortcut_handler = new ShortcutsIssuable(true);
           break;
         case 'dashboard:activity':
-          new Activities();
+          import('./pages/dashboard/activity')
+            .then(callDefault)
+            .catch(fail);
           break;
         case 'projects:commit:show':
           new Diff();

app/assets/javascripts/pages/dashboard/activity/index.js

+import Activities from '~/activities';
+
+export default () => new Activities();