PHP 5.6.RC4
update twig to 1.16.0
Merge branch '5_4_mountainlion' into 5_5_mountainlion

* 5_4_mountainlion:
  update twig to 1.16.0
Merge branch '5_5_mountainlion' into 5_6_mountainlion

* 5_5_mountainlion:
  update twig to 1.16.0