Add branch, tag info to Diffusion Headers

Summary: Improves overall UX of browsing Diffusion. Clarifies branch and tag when possible, changes 'home' to 'code', uses tabs in more locations. Fixes T12837

Test Plan: Review branchs, tags, git, hg, search, browse, history.

Reviewers: epriestley

Reviewed By: epriestley

Subscribers: Korvin

Maniphest Tasks: T12837

Differential Revision: https://secure.phabricator.com/D18434

src/applications/diffusion/controller/DiffusionGraphController.php

@@ -11,6 +11,7 @@ final class DiffusionGraphController extends DiffusionController {
     if ($response) {
       return $response;
     }
+    require_celerity_resource('diffusion-css');
 
     $viewer = $this->getViewer();
     $drequest = $this->getDiffusionRequest();
@@ -83,6 +84,7 @@ final class DiffusionGraphController extends DiffusionController {
 
   private function buildHeader(DiffusionRequest $drequest) {
     $viewer = $this->getViewer();
+    $repository = $drequest->getRepository();
 
     $no_path = !strlen($drequest->getPath());
     if ($no_path) {
@@ -96,6 +98,11 @@ final class DiffusionGraphController extends DiffusionController {
       ->setHeader($header_text)
       ->setHeaderIcon('fa-code-fork');
 
+    if (!$repository->isSVN()) {
+      $branch_tag = $this->renderBranchTag($drequest);
+      $header->addTag($branch_tag);
+    }
+
     return $header;
 
   }