title: Class 'Locale' not found issue on CakePHP 3
body: <p>I'm just downloaded the files from <a href="http://bakery.cakephp.org/articles/lorenzo/2014/09/28/cakephp_3_0_0-beta2_released" rel="noreferrer">this link</a>, extracted and tried execute but I had this error:</p>
  
  <pre><code>Fatal error: Class 'Locale' not found in D:\xampp\htdocs\cake-3-beta-2\vendor\cakephp\cakephp\src\I18n\I18n.php on line 229
  </code></pre>
  
  <p>I'm running on localhost with xampp... I had the same issue with beta 1 and 2.</p>