Minor config class tweaks.

Author: dragoonis

src/Config/ConfigLoader.php

@@ -15,6 +15,7 @@
 use PPI\Framework\Config\Loader\IniFileLoader;
 use PPI\Framework\Config\Loader\PhpFileLoader;
 use PPI\Framework\Config\Loader\YamlFileLoader;
+use Symfony\Component\Config\Loader\LoaderInterface;
 use Symfony\Component\Config\Loader\LoaderResolver;
 
 /**
@@ -62,7 +63,7 @@ public function load($resource, $type = null)
      *
      * @return DelegatingLoader The loader
      */
-    protected function getLoader()
+    public function getLoader()
     {
         if (null === $this->loader) {
             $locator  = new FileLocator($this->paths);

src/Config/Loader/YamlFileLoader.php

@@ -13,6 +13,7 @@
 use Symfony\Component\Config\Loader\FileLoader;
 use Symfony\Component\Yaml\Parser as YamlParser;
 use Zend\Stdlib\ArrayUtils;
+use \InvalidArgumentException;
 
 /**
  * YamlFileLoader loads app configuration from a YAML file.