Fixes optional argument before required argument.

Author: jonesiscoding

DataFixtures/Loader/AbstractDataLoader.php

@@ -45,7 +45,7 @@ abstract protected function transformDataToArray($file);
     /**
      * {@inheritdoc}
      */
-    public function load($files = array(), $connectionName)
+    public function load($files = array(), $connectionName = 'default')
     {
         $nbFiles = 0;
         $this->deletedClasses = array();

DataFixtures/Loader/DataLoaderInterface.php

@@ -22,5 +22,5 @@ interface DataLoaderInterface
      * @param array  $files          A set of files containing datas to load.
      * @param string $connectionName The Propel connection name
      */
-    public function load($files = array(), $connectionName);
+    public function load($files = array(), $connectionName = 'default');
 }

DataFixtures/Loader/DataWiper.php

@@ -20,7 +20,7 @@ class DataWiper extends AbstractDataLoader
      * @param array  $files          A set of files containing datas to load.
      * @param string $connectionName The Propel connection name
      */
-    public function load($files = array(), $connectionName)
+    public function load($files = array(), $connectionName = 'default')
     {
         $this->deletedClasses = array();
         $this->loadMapBuilders($connectionName);