Deal with case-insensitive class references of PHP

Here's the problem:

`MyClass` resides in `MyClass.php`. A case-sensitive autoloader work with 

``` php
$c = new MyClass;
```

but not with

``` php
$c = new myClass;
```

But this will surely work:

``` php
$c = new MyClass;
$d = new myclass;
```

https://r.je/php-autoloaders-should-not-be-case-sensitive.html
