Update to drupal 8.0.0-rc1. For more information, see https://www.drupal.org/node/2582663

vendor/symfony/dependency-injection/README.md

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+DependencyInjection Component
+=============================
+
+DependencyInjection manages your services via a robust and flexible Dependency
+Injection Container.
+
+Here is a simple example that shows how to register services and parameters:
+
+```php
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Reference;
+
+$sc = new ContainerBuilder();
+$sc
+    ->register('foo', '%foo.class%')
+    ->addArgument(new Reference('bar'))
+;
+$sc->setParameter('foo.class', 'Foo');
+
+$sc->get('foo');
+```
+
+Method Calls (Setter Injection):
+
+```php
+$sc = new ContainerBuilder();
+
+$sc
+    ->register('bar', '%bar.class%')
+    ->addMethodCall('setFoo', array(new Reference('foo')))
+;
+$sc->setParameter('bar.class', 'Bar');
+
+$sc->get('bar');
+```
+
+Factory Class:
+
+If your service is retrieved by calling a static method:
+
+```php
+$sc = new ContainerBuilder();
+
+$sc
+    ->register('bar', '%bar.class%')
+    ->setFactory(array('%bar.class%', 'getInstance'))
+    ->addArgument('Aarrg!!!')
+;
+$sc->setParameter('bar.class', 'Bar');
+
+$sc->get('bar');
+```
+
+File Include:
+
+For some services, especially those that are difficult or impossible to
+autoload, you may need the container to include a file before
+instantiating your class.
+
+```php
+$sc = new ContainerBuilder();
+
+$sc
+    ->register('bar', '%bar.class%')
+    ->setFile('/path/to/file')
+    ->addArgument('Aarrg!!!')
+;
+$sc->setParameter('bar.class', 'Bar');
+
+$sc->get('bar');
+```
+
+Resources
+---------
+
+You can run the unit tests with the following command:
+
+    $ cd path/to/Symfony/Component/DependencyInjection/
+    $ composer install
+    $ phpunit