PHP Fatal error: Call-time pass-by-reference has been removed; If you would like to pass argument by reference, modify the declaration of do_action().

Hey guys, line 195 of wp-less.php needs to be

```php
do_action( 'lessc', array( &$less ) );
```

(i.e. you need to wrap the arg in an array when passing by reference). Tested in a child theme of twentytwelve.