[ticket/13130] Updates dependencies to Symfony 2.5

PHPBB3-13130
[ticket/12368] Always clean the cache prior to run the migrations

PHPBB3-12368
Merge pull request #3022 from Nicofuma/ticket/12368

[ticket/12368] Always clean the cache prior to run the migrations
Merge branch 'develop-ascraeus' into develop
[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