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diff --git a/vendor/symfony/dependency-injection/Extension/Extension.php b/vendor/symfony/dependency-injection/Extension/Extension.php
new file mode 100644
index 000000000..ced39f728
--- /dev/null
+++ b/vendor/symfony/dependency-injection/Extension/Extension.php
@@ -0,0 +1,118 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Extension;
+
+use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\Exception\BadMethodCallException;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\Config\Resource\FileResource;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\Config\Definition\Processor;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+
+/**
+ * Provides useful features shared by many extensions.
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+abstract class Extension implements ExtensionInterface, ConfigurationExtensionInterface
+{
+    /**
+     * {@inheritdoc}
+     */
+    public function getXsdValidationBasePath()
+    {
+        return false;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getNamespace()
+    {
+        return 'http://example.org/schema/dic/'.$this->getAlias();
+    }
+
+    /**
+     * Returns the recommended alias to use in XML.
+     *
+     * This alias is also the mandatory prefix to use when using YAML.
+     *
+     * This convention is to remove the "Extension" postfix from the class
+     * name and then lowercase and underscore the result. So:
+     *
+     *     AcmeHelloExtension
+     *
+     * becomes
+     *
+     *     acme_hello
+     *
+     * This can be overridden in a sub-class to specify the alias manually.
+     *
+     * @return string The alias
+     *
+     * @throws BadMethodCallException When the extension name does not follow conventions
+     */
+    public function getAlias()
+    {
+        $className = get_class($this);
+        if (substr($className, -9) != 'Extension') {
+            throw new BadMethodCallException('This extension does not follow the naming convention; you must overwrite the getAlias() method.');
+        }
+        $classBaseName = substr(strrchr($className, '\\'), 1, -9);
+
+        return Container::underscore($classBaseName);
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    public function getConfiguration(array $config, ContainerBuilder $container)
+    {
+        $reflected = new \ReflectionClass($this);
+        $namespace = $reflected->getNamespaceName();
+
+        $class = $namespace.'\\Configuration';
+        if (class_exists($class)) {
+            $r = new \ReflectionClass($class);
+            $container->addResource(new FileResource($r->getFileName()));
+
+            if (!method_exists($class, '__construct')) {
+                return new $class();
+            }
+        }
+    }
+
+    final protected function processConfiguration(ConfigurationInterface $configuration, array $configs)
+    {
+        $processor = new Processor();
+
+        return $processor->processConfiguration($configuration, $configs);
+    }
+
+    /**
+     * @param ContainerBuilder $container
+     * @param array            $config
+     *
+     * @return bool Whether the configuration is enabled
+     *
+     * @throws InvalidArgumentException When the config is not enableable
+     */
+    protected function isConfigEnabled(ContainerBuilder $container, array $config)
+    {
+        if (!array_key_exists('enabled', $config)) {
+            throw new InvalidArgumentException("The config array has no 'enabled' key.");
+        }
+
+        return (bool) $container->getParameterBag()->resolveValue($config['enabled']);
+    }
+}