silverstripe-installer/mysite/_config.php

<?php

global $project;
$project = 'mysite';

global $database;
$database = 'SS_dynamictemplate_dev';

require_once('conf/ConfigureFromEnv.php');

MySQLDatabase::set_connection_charset('utf8');

// This line set's the current theme. More themes can be
// downloaded from http://www.silverstripe.org/themes/
SSViewer::set_theme('blackcandy');

// enable nested URLs for this site (e.g. page/sub-page/)
SiteTree::enable_nested_urls();
Security::setDefaultAdmin('admin','password');

File::$allowed_extensions[] = "ss";