Added support for the PATCH method
Added support for the PATCH method

http://tools.ietf.org/html/rfc2068#section-19.6.1.1
http://tools.ietf.org/html/rfc5789

ygerasimov/HttpFoundation,nichdu/HttpFoundation,mneuhaus/HttpFoundation,symfony/http-foundation,symfony/HttpFoundation,oswaldderiemaecker/HttpFoundation