use attribute as key in assets type (#1)

* use attribute as key in assets type

cs

* change name to type

Author: bartlomiejbeta

AssetsBundle/DependencyInjection/Configuration.php

@@ -35,6 +35,7 @@ public function addTypes(NodeBuilder $node)
         // @formatter:off
         /** @noinspection PhpUndefinedMethodInspection */
         $node->arrayNode('types')
+                ->useAttributeAsKey('type')
                 ->prototype('array')
                 ->addDefaultsIfNotSet()
                 ->children()