Examples not working when component is installed via composer

In each example, we are going straight to the autoloader this way.

```php
require_once __DIR__ . '/../vendor/autoload.php';
```

This is not working when things are installed via composer.

Add a check and try to find the real autoloader. If needed (since this is common, put this helper into a dedicated component.).

```php
require_once __DIR__ . '/../../../autoload.php';
```