Display file name in <title> for easier browsing of code

Summary:
Having the filename in the <title> will make it easier to browse through many
many tabs of diffusion

Test Plan:
Open up a file or directory in diffusion and ensure that it shows only the file
name.

Reviewed By: tuomaspelkonen
Reviewers: epriestley, tuomaspelkonen, jungejason
Commenters: epriestley
CC: epriestley, aizatto, tuomaspelkonen
Differential Revision: 150

src/applications/diffusion/controller/file/DiffusionBrowseFileController.php

@@ -83,10 +83,12 @@ class DiffusionBrowseFileController extends DiffusionController {
     $nav = $this->buildSideNav('browse', true);
     $nav->appendChild($content);
 
+    $basename = basename($this->getDiffusionRequest()->getPath());
+
     return $this->buildStandardPageResponse(
       $nav,
       array(
-        'title' => 'Browse',
+        'title' => $basename,
       ));
   }