Merge branch '3.4'

* 3.4:
  use the parseFile() method of the YAML parser
  [Yaml] support parsing files
  Adding Definition::addError() and a compiler pass to throw errors as exceptions
  [DI] Add AutowireRequiredMethodsPass to fix bindings for `@required` methods
  [Cache] Add ResettableInterface to allow resetting any pool's local state
  [DI][DX] Throw exception on some ContainerBuilder methods used from extensions
  added missing @author tag for new class
  allow forms without translations and validator
  [VarDumper] Make `dump()` a little bit more easier to use
  [Form] Add ambiguous & exception debug:form tests
  Reset the authentication token between requests.
  [Serializer] Getter for extra attributes in ExtraAttributesException
  [DI] Dont use JSON_BIGINT_AS_STRING

# Conflicts:
#	src/Symfony/Component/Routing/composer.json
#	src/Symfony/Component/Translation/composer.json
#	src/Symfony/Component/Yaml/Inline.php
#	src/Symfony/Component/Yaml/Tests/ParserTest.php
#	src/Symfony/Component/Yaml/Yaml.php

Author: ogizanagi

Loader/YamlFileLoader.php

@@ -58,7 +58,7 @@ public function load($file, $type = null)
         }
 
         try {
-            $parsedConfig = $this->yamlParser->parse(file_get_contents($path));
+            $parsedConfig = $this->yamlParser->parseFile($path);
         } catch (ParseException $e) {
             throw new \InvalidArgumentException(sprintf('The file "%s" does not contain valid YAML.', $path), 0, $e);
         }