Feature: Resolve relative URIs, add withBase() and resolve() (#41, #44)

$browser = $browser->withBase('http://example.com/');
$browser->post('/');

Feature: Resolve URI template placeholders according to RFC 6570 (#42, #44)

$browser->post($browser->resolve('/{+path}{?version}', array(
    'path' => 'demo.json',
    'version' => '4'
)));

Feature: Resolve and follow redirects to relative URIs (#45)

Feature / BC break: Simplify Request and Response objects. Remove Browser::request(), use Browser::send() instead. (#37)

// old
$browser->request('GET', 'http://www.example.com/');

// new
$browser->send(new Request('GET', 'http://www.example.com/'));

Feature / Bc break: Enforce absolute URIs via new Uri class (#40, #44)

Feature: Add Browser::withSender() method (#38)

Feature: Add Sender::createFromLoopDns() function (#39)

Improve documentation and test suite