Fixed the Configuration class

It now supports XML config files properly and the default value for the
logo works when the site is not at the root of the domain.

DependencyInjection/Configuration.php

@@ -35,23 +35,20 @@ class Configuration implements ConfigurationInterface
         $treeBuilder = new TreeBuilder();
         $rootNode = $treeBuilder->root('sonata_admin', 'array');
 
-        $this->addTemplateSection($rootNode);
-
-        return $treeBuilder;
-    }
-
-    private function addTemplateSection(ArrayNodeDefinition $rootNode)
-    {
         $rootNode
+            ->fixXmlConfig('dashboard_group')
+            ->fixXmlConfig('admin_service')
             ->children()
                 ->scalarNode('security_handler')->defaultValue('sonata.admin.security.handler.noop')->end()
 
                 ->scalarNode('title')->defaultValue('Sonata Admin')->cannotBeEmpty()->end()
-                ->scalarNode('title_logo')->defaultValue('/bundles/sonataadmin/logo_title.png')->cannotBeEmpty()->end()
+                ->scalarNode('title_logo')->defaultValue('bundles/sonataadmin/logo_title.png')->cannotBeEmpty()->end()
 
                 ->arrayNode('dashboard_groups')
                     ->useAttributeAsKey('id')
                     ->prototype('array')
+                        ->fixXmlConfig('item')
+                        ->fixXmlConfig('item_add')
                         ->children()
                             ->scalarNode('label')->end()
                             ->arrayNode('items')
@@ -68,7 +65,6 @@ class Configuration implements ConfigurationInterface
                     ->useAttributeAsKey('id')
                     ->prototype('array')
                         ->children()
-                            ->scalarNode('id')->end()
                             ->scalarNode('model_manager')->end()
                             ->scalarNode('form_contractor')->end()
                             ->scalarNode('show_builder')->end()
@@ -97,5 +93,7 @@ class Configuration implements ConfigurationInterface
                 ->end()
             ->end()
         ->end();
+
+        return $treeBuilder;
     }
 }