title: default controller inside subfolder codeigniter 3 not working
body: <p>In codeigniter 3 application i have directory structure like this:</p>
  
  <pre><code>-Myproject
    -application
      -controllers
       -home
         Welcome.php   //This is my controller inside home directory
  </code></pre>
  
  <p>How to set Welcome controller as default controller?
  I use below code</p>
  
  <pre><code>$route['default_controller'] = 'home/Welcome';
  </code></pre>
  
  <p>This routing works for previous versions of codeigniter.</p>