Merge branch '2.2'

* 2.2:
  added additional tests to cover invalid argument exceptions in OutputFormatterStyle component
  added a missing check for the provider key
  [Validator] fixed wrong URL for XSD
  [Validator] Fixed: $traverse and $deep is passed to the visitor from Validator::validate()
  [Form] Fixed transform()/reverseTransform() to always throw TransformationFailedExceptions
  [Form] Fixed: String validation groups are never interpreted as callbacks
  if the repository method returns an array ensure that it's internal poin...
  [Form] Improved multi-byte handling of NumberToLocalizedStringTransformer
  Fix wrong method in findTaggedServiceIds(), add example to docblock.

Conflicts:
	src/Symfony/Component/Form/Extension/Core/DataTransformer/ChoicesToBooleanArrayTransformer.php
	src/Symfony/Component/Form/Extension/Validator/Constraints/FormValidator.php

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