* igorw/master:
  fix extension test namespaces
  rename WebTestCase::{createApp => createApplication}
  do not read files twice when compiling

Usage:

    $app->register(new SwiftmailerExtension(), array(
        'swiftmailer.options' => array(
            'host'       => 'smtp.gmail.com',
            'port'       => 465,
            'encryption' => 'ssl',
            'auth_mode'  => 'login',
            'username'   => 'xxxxxx',
            'password'   => 'yyyyyy',
        )
    ));

    $app['mailer']->send($app['mailer']
        ->createMessage()
        ->setFrom('foo@example.com')
        ->addTo('bar@example.com')
        ->setSubject('Foo Title')
        ->setBody('Foo Body')
    );

* igorw/escape-docs:
  [docs] some docs for escape()

Usage:

    $form = $app['form.factory']->createBuilder('form')
       ->add('first_name', 'text')
       ->add('last_name', 'text');

    return $app['twig']->render('form', array('form' => $form->getView()));

* igorw/session2:
  add some docs about extension conventions
  [SessionExtension] docs on how to use the SessionExtension

* igorw/escape:
  [escape] html escaping shortcut

* igorw/callable-controller:
  fix documentation on callable controllers (thanks Bart)

* igorw/more-docs:
  [docs] a section about common pitfalls
  [docs] style adjustment
  [docs] emphasis on "let's go"
  [docs] explain the purpose of the JsonUserPersister
  [docs] add cross-references to Symfony2 API docs
  [docs] several small adjustments

* igorw/httpexception:
  rename BaseHttpException to HttpException

Dashes are common in URL patterns, so it would be helpful to convert them to underscores for default route generation. Any invalid characters (according to Symfony\Component\Routing\RouteCollection) should be stripped entirely, lest an exception is raised.

If a route ends with a / and the user forgets the / (and a similar route without a / does not exist),
then, the user will be redirected to the real URL:

If you have a /doc/ URL pattern, a request to /doc will redirect you to /doc/

This is especially useful for the root URL (/):

/index.php (which does not make sense as the path info is / at a minimum)
redirects to /index.php/