title: Codeigniter 3 - Make URLs case insensitive
body: <p>With CI3 released controllers must now be Ucword-style (for whatever reason). No problem changing these, but upgrading any site now leads to 404s wherever it's applicable (which is pretty much everywhere).
  Is there a way to make it so the old URLs still work (in addition)?  Ie I have a controller 'Admin.php" the index() fn of which used to be called</p>
  
  <pre><code>   http://example.com/admin
  </code></pre>
  
  <p>now it must be called</p>
  
  <pre><code>       http://example.com/Admin
  </code></pre>
  
  <p>Is there a way to have both work (on CentOS). Maybe via Apache rewrite and/or config?</p>