title: Replacement for File::mime() in Laravel 4 (to get mime type from file extension)
body: <p>Laravel 3 had a <strong><a href="http://three.laravel.com/docs/files#mime" rel="noreferrer">File::mime()</a></strong> method which made it easy to get a file's mime type from its extension:</p>
  
  <pre><code>$extension = File::extension($path);
  $mime = File::mime($extension);
  </code></pre>
  
  <p>On upgrading to Laravel 4 I get an error:</p>
  
  <p><strong>Call to undefined method Illuminate\Filesystem\Filesystem::mime()</strong></p>
  
  <p>I also can't see any mention of mime types in the <a href="http://laravel.com/api/class-Illuminate.Filesystem.Filesystem.html" rel="noreferrer">Filesystem API docs</a>.</p>
  
  <p>What's the recommended way to get a file's mime type in Laravel 4 (please note this is not a user-uploaded file)?</p>