Upgrade app packages (Symfony 3.0.0 → 3.2.2, Twig 2)

* twig/twig (v1.28.2 => v2.1.0)
* symfony/symfony (v3.2.0 => v3.2.2)
* doctrine/collections (v1.3.0 => v1.4.0)
* doctrine/annotations (v1.3.0 => v1.3.1)
* doctrine/common (v2.6.2 => v2.7.2)
* doctrine/dbal (v2.5.5 => v2.5.10)
* doctrine/orm (v2.5.5 => v2.5.6)
* doctrine/doctrine-bundle (1.6.4 => 1.6.7)
* swiftmailer/swiftmailer (v5.4.4 => v5.4.5)
* symfony/swiftmailer-bundle (v2.4.0 => v2.4.2)
* symfony/monolog-bundle (3.0.1 => v3.0.3)
* sensio/distribution-bundle (v5.0.15 => v5.0.18)
* sensio/framework-extra-bundle (v3.0.16 => v3.0.19)
* symfony/phpunit-bridge (v3.2.0 => v3.2.2)

Author: Michaël Perrin