symfony/symfony-standard — pull request #648 by glensc (2014-04-11 20:12:29+00:00)
Title: SymfonyRequirements.php: add filter requirement

filter extension should be enabled, or you may get such error when validating:

UndefinedFunctionException: Attempted to call function "filter_var" from namespace "Symfony\Component\Validator\Constraints"