* 2.3:
No global state for isolated tests and other fixes
[TwigBundle] Moved the setting of the default escaping strategy from the Twig engine to the Twig environment
[Debug] fix checkip6
[HttpFoundation] fixed error when an IP in the X-Forwarded-For HTTP header contains a port
Update the note about origins of the CssSelector component.
Use the correct cssselect library name in docblocks.