[ticket/13130] Updates dependencies to Symfony 2.5

PHPBB3-13130
[ticket/13130] Fix tests

PHPBB3-13130
Merge pull request #3020 from Nicofuma/ticket/13130

[ticket/13130] Updates dependencies to Symfony 2.5

* Nicofuma/ticket/13130:
  [ticket/13130] Fix tests
  [ticket/13130] Updates dependencies to Symfony 2.5