title: Using klein.php without composer?
body: <p>Is there any code example? Here's what I got:</p>
  
  <pre><code>// index.php
  
  require_once __DIR__ . '/Klein/Klein.php';
  
  $klein = new \Klein\Klein();
  
  $klein-&gt;respond(function () {
      return 'All the things';
  });
  </code></pre>
  
  <p>On PHP 5.3 this returns an error (Fatal error: Class 'Klein\ServiceProvider' not found in).</p>