외부 코드를 Composer 기반으로 변경

vendor/composer/autoload_psr4.php

@@ -0,0 +1,10 @@
+<?php
+
+// autoload_psr4.php @generated by Composer
+
+$vendorDir = dirname(dirname(__FILE__));
+$baseDir = dirname($vendorDir);
+
+return array(
+    'League\\Plates\\' => array($vendorDir . '/league/plates/src'),
+);