Merge branch '2.8' into 3.4

* 2.8:
  fixed Twig URL
  Don't assume that file binary exists on *nix OS
  Fix that ESI/SSI processing can turn a \"private\" response \"public\"
  [Form] Fixed trimming choice values

Author: fabpot

README.md

@@ -1,7 +1,7 @@
 Twig Bridge
 ===========
 
-Provides integration for [Twig](http://twig.sensiolabs.org/) with various
+Provides integration for [Twig](https://twig.symfony.com/) with various
 Symfony components.
 
 Resources