Fall back on default config if custom one is not available.

header.php

@@ -5,6 +5,11 @@ require_once( dirname(__FILE__).'/includes/load-yourls.php' );
 
 // Ask for Infinity Squared settings
 include( dirname(__FILE__).'/public/config.php' );
+
+if( ( @include dirname(__FILE__).'/public/config.php' ) === false) {
+	include( dirname(__FILE__).'/public/config-sample.php' );
+}
+
 class ISQ { public static $general = array(), $links = array(), $social = array(), $recaptcha = array(); }
 
 // Load translations