added yaml support (#106)

Author: Silas Joisten

Loader/LoaderFactory.php

@@ -27,6 +27,7 @@ public function createLoaderForSource(ContainerBuilder $container, $source)
 
         switch ($extension) {
             case 'yml':
+            case 'yaml':
                 return $this->createYamlFileLoader($container);
             case 'xml':
                 return $this->createXmlFileLoader($container);

Tests/Loader/LoaderFactoryTest.php

@@ -37,6 +37,7 @@ public function fileProvider()
         return [
             ['file.xml', 'Symfony\Component\DependencyInjection\Loader\XmlFileLoader'],
             ['file.yml', 'Symfony\Component\DependencyInjection\Loader\YamlFileLoader'],
+            ['file.yaml', 'Symfony\Component\DependencyInjection\Loader\YamlFileLoader'],
             ['file.php', 'Symfony\Component\DependencyInjection\Loader\PhpFileLoader'],
         ];
     }