guzzle/guzzle — pull request #273 by jeremeamia (2013-03-27 19:56:23+00:00)
Title: Overwrite config params for throw-away clients in the service builder

```php
$builder = new ServiceBuilder(array(
'client' => array(
'class' => 'My\Cool\Client',
'params' => array(
'base_url' => 'http://www.my-url.com/',
'foo' => 'bar',
)
)
));

// Normal client with normal config
$client1 = $builder->get('client');

// Throw-away client with normal config
$client2 = $builder->get('client', true);

// Throw-away client with modified config
$client3 = $builder->get('client', array('foo' => 'baz'));
```