Remove all older-style navs

Summary: Move all navs to use the newer-style, darker, textured look. I'm //pretty// sure this doesn't break anything.

Test Plan: Looked at a bunch of apps.

Reviewers: btrahan, chad

Reviewed By: chad

CC: aran

Differential Revision: https://secure.phabricator.com/D4376

src/applications/base/controller/PhabricatorController.php

@@ -160,7 +160,6 @@ abstract class PhabricatorController extends AphrontController {
     }
 
     $view->setUser($this->getRequest()->getUser());
-    $view->setFlexNav(true);
 
     $page->appendChild($view);