Ensure craue_config_setting migration are ok

We now can run the migration every time, new line from `craue_config_setting` are properly checked.

app/DoctrineMigrations/Version20161122144743.php

@@ -32,6 +32,13 @@ class Version20161122144743 extends AbstractMigration implements ContainerAwareI
      */
     public function up(Schema $schema)
     {
+        $access = $this->container
+            ->get('doctrine.orm.default_entity_manager')
+            ->getConnection()
+            ->fetchArray('SELECT * FROM '.$this->getTable('craue_config_setting').' WHERE name = "restricted_access"');
+
+        $this->skipIf(false !== $access, 'It seems that you already played this migration.');
+
         $this->addSql('INSERT INTO '.$this->getTable('craue_config_setting')." (name, value, section) VALUES ('restricted_access', 0, 'entry')");
     }