A week of symfony #408 (20->26 October 2014)

This week, Symfony Serializer component added support for handling circular references and DependencyInjection fixed some problems with aliases and circular references. Meanwhile, some interesting proposals were made for future Symfony versions, such as decoupling type validation from constraint validators and removing Blank/NotBlank constraints.

957fbb2: [Tests] PHPUnit Optimizations
6020c43, 974bf01, 00c1b75: fixed some volatile tests
b63926b: [Finder] escape location for regex searches
902efb8: [HttpKernel] made sure HttpCache is a trusted proxy
fab61ef: [Translation] clear libxml errors after parsing XML file
5fbb278: [Finder] avoid question mark and asterisk in folder names to prevent windows filesystem issues
42ec76e: [HttpFoundation] Response::isNotModified returns true when If-Modified-Since is later than Last-Modified
4780210: [Form] added a form error if postmaxsize has been reached
759ae1a: [Form] moved POSTMAXSIZE validation from FormValidator to request handler
e85cb7f: added the possibility to return null from SimplePreAuthenticationListener
9333395: [Security] fixed createToken() doesn't return TokenInterface object in SimplePreAuthenticationListener
24c5ba4: [TwigBundle] use request format from request in twig ExceptionController
fd77b09: [Form] fixed ValidatorTypeGuesser to guess properties without constraints not to be required

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