Add tabs to Diffusion for consistent navigation

Summary:
Adds a responsive tab bar navigation to Diffusion. Working through the new design here in pieces, so keep in mind M1477 is the target. Notably:

- Removes "branches" and "tags" from RevisionView, now on tabs
- Keeps "browse", "history", "readme" on RevisionView
- Adds tabs for all main views, including Graph... unless how that feels, so let me know.

Test Plan: Browse all pages, desktop and mobile. Test hg, svn, git repositories.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Differential Revision: https://secure.phabricator.com/D18161

src/applications/diffusion/controller/DiffusionBranchTableController.php

@@ -71,8 +71,11 @@ final class DiffusionBranchTableController extends DiffusionController {
       ->setHeader(pht('Branches'))
       ->setHeaderIcon('fa-code-fork');
 
+    $tabs = $this->buildTabsView('branch');
+
     $view = id(new PHUITwoColumnView())
       ->setHeader($header)
+      ->setTabs($tabs)
       ->setFooter(array(
           $content,
       ));