[Routing][DependencyInjection] Support .yaml extension in YAML loaders

Author: thunderer

Loader/YamlFileLoader.php

@@ -73,7 +73,7 @@ public function load($resource, $type = null)
      */
     public function supports($resource, $type = null)
     {
-        return is_string($resource) && 'yml' === pathinfo($resource, PATHINFO_EXTENSION);
+        return is_string($resource) && in_array(pathinfo($resource, PATHINFO_EXTENSION), array('yml', 'yaml'), true);
     }
 
     /**

Tests/Loader/YamlFileLoaderTest.php

@@ -187,6 +187,7 @@ public function testSupports()
         $loader = new YamlFileLoader(new ContainerBuilder(), new FileLocator());
 
         $this->assertTrue($loader->supports('foo.yml'), '->supports() returns true if the resource is loadable');
+        $this->assertTrue($loader->supports('foo.yaml'), '->supports() returns true if the resource is loadable');
         $this->assertFalse($loader->supports('foo.foo'), '->supports() returns true if the resource is loadable');
     }