Added function `php-lineup-arglist`

I added this function to allow for variable indentation inside arglists. I did
this so the Symfony2 style would format a function call like this:

```php
$this->factory->addType(
    $this
        ->getMockBuilder('Symfony\Bridge\Doctrine\Form\Type\EntityType')
        ->disableOriginalConstructor()
        ->getMock(),
    $next
);
```

instead of this:

```php
$this->factory->addType(
    $this
    ->getMockBuilder('Symfony\Bridge\Doctrine\Form\Type\EntityType')
    ->disableOriginalConstructor()
    ->getMock(),
    $next
);
```

It's possible this could be wanted behavior in the other styles.