Merge pull request #47 from WouterJ/enable-patch

Changed to canBeEnabled

Author: dbu

DependencyInjection/Configuration.php

@@ -31,8 +31,8 @@ public function getConfigTreeBuilder()
                     ->children()
                         ->arrayNode('phpcr')
                             ->addDefaultsIfNotSet()
+                            ->canBeEnabled()
                             ->children()
-                                ->booleanNode('enabled')->defaultFalse()->end()
                                 ->scalarNode('session_name')->defaultValue('default')->end()
                             ->end()
                         ->end()