fix symfony/yaml >= 3.0

app/Config/YamlConfigDriver.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Evaneos\REST\Config;
+
+use Igorw\Silex\YamlConfigDriver as BaseYamlConfigDriver;
+use Symfony\Component\Yaml\Yaml;
+
+class YamlConfigDriver extends BaseYamlConfigDriver
+{
+    public function load($filename)
+    {
+        if (!class_exists('Symfony\\Component\\Yaml\\Yaml')) {
+            throw new \RuntimeException('Unable to read yaml as the Symfony Yaml Component is not installed.');
+        }
+
+        $config = Yaml::parse(file_get_contents($filename));
+
+        return $config ?: [];
+    }
+}

app/Kernel/Kernel.php

@@ -7,8 +7,8 @@
 use Doctrine\Common\Annotations\AnnotationRegistry;
 use Doctrine\Common\Cache\ApcuCache;
 use Evaneos\REST\Config\CacheConfigDriver;
+use Evaneos\REST\Config\YamlConfigDriver;
 use Igorw\Silex\ConfigServiceProvider;
-use Igorw\Silex\YamlConfigDriver;
 use Monolog\Formatter\JsonFormatter;
 use Monolog\Handler\HandlerInterface;
 use Monolog\Logger;