you can get the current version by calling the phar without arguments:

    $ php silex.phar
    Silex version 1ee6b36

there is only one single `update` command:

    $ php silex.phar update

this will fetch the latest version of the phar from silex-project.org
and replace the current one with it.

this makes it easier for users because they can easily update. we could
potentially even provide a changelog on running the command.

this commit also introduces a Silex\Application::VERSION constant that
currently is set to the current git SHA-1, as I proposed in PR 33. This
is done by the Compiler. It can later be adjusted to use `git describe`.

this is an implementation of PR 35 without the console component.

* 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)