Rename file to math the classname

appinfo/app.php

@@ -33,4 +33,4 @@ OCP\App::addNavigationEntry(array(
 	'name' => 'Office')
 );
 
-OC::$CLASSPATH['OCA\Office\Storage'] = 'office/lib/office.php';
+OC::$CLASSPATH['OCA\Office\Storage'] = 'office/lib/storage.php';