Added description of Symfony2 style.

Signed-off-by: Eric James Michael Ritz <lobbyjones@gmail.com>
Added function php-lineup-arglist to allow for variable indentation inside the
arglist.  I added it so that 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
);
```
Merge remote-tracking branch 'refs/remotes/upstream/master'