Array config

An array of configuration values can now be passed to `PHPCheckstyle@__construct` rather than an XML file.

`runFromWeb.php` shows how this can be done with a simple setting for indentation to be 2 spaces:

```php
$configFile = array(
	'indentation' => array(
		"type" => "spaces",
		"number" => 2
	)
);
```

Closes #3