[Yaml] Normalize exceptions

Exception/DumpException.php

@@ -18,6 +18,6 @@
  *
  * @api
  */
-class DumpException extends \RuntimeException implements ExceptionInterface
+class DumpException extends RuntimeException
 {
 }

Exception/ParseException.php

@@ -18,7 +18,7 @@
  *
  * @api
  */
-class ParseException extends \RuntimeException implements ExceptionInterface
+class ParseException extends RuntimeException
 {
     private $parsedFile;
     private $parsedLine;

Exception/RuntimeException.php

@@ -0,0 +1,23 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Yaml\Exception;
+
+/**
+ * Exception class thrown when an error occurs during parsing.
+ *
+ * @author Romain Neutron <imprec@gmail.com>
+ *
+ * @api
+ */
+class RuntimeException extends \RuntimeException implements ExceptionInterface
+{
+}

Unescaper.php

@@ -130,7 +130,7 @@ public function unescapeCharacter($value)
      *
      * @return string The string with the new encoding
      *
-     * @throws \RuntimeException if no suitable encoding function is found (iconv or mbstring)
+     * @throws RuntimeException if no suitable encoding function is found (iconv or mbstring)
      */
     private function convertEncoding($value, $to, $from)
     {
@@ -140,6 +140,6 @@ private function convertEncoding($value, $to, $from)
             return iconv($from, $to, $value);
         }
 
-        throw new \RuntimeException('No suitable convert encoding function (install the iconv or mbstring extension).');
+        throw new RuntimeException('No suitable convert encoding function (install the iconv or mbstring extension).');
     }
 }