feature #498 Updated dependencies to Symfony 3.2.5 (javiereguiluz)

This PR was merged into the master branch.

Discussion
----------

Updated dependencies to Symfony 3.2.5

```
  - Updating ezyang/htmlpurifier (v4.8.0 => v4.9.1)
  - Updating twig/twig (v1.31.0 => v1.32.0)
  - Updating paragonie/random_compat (v2.0.4 => v2.0.9)
  - Updating symfony/symfony (v3.2.3 => v3.2.5)
  - Installing ircmaxell/password-compat (v1.0.4)
  - Installing symfony/polyfill-php55 (v1.3.0)
  - Updating sensio/framework-extra-bundle (v3.0.21 => v3.0.23)
  - Updating swiftmailer/swiftmailer (v5.4.5 => v5.4.6)
  - Updating symfony/swiftmailer-bundle (v2.4.2 => v2.5.3)
  - Updating white-october/pagerfanta-bundle (v1.0.7 => v1.0.8)
  - Updating sebastian/recursion-context (1.0.2 => 1.0.5)
  - Updating phpunit/php-timer (1.0.8 => 1.0.9)
  - Updating phpunit/php-token-stream (1.4.9 => 1.4.11)
  - Updating phpspec/prophecy (v1.6.2 => v1.7.0)
  - Updating doctrine/dbal (v2.5.11 => v2.5.12)
  - Updating dama/doctrine-test-bundle (v1.0.9 => v1.0.10)
  - Installing symfony/polyfill-xml (v1.3.0)
  - Updating friendsofphp/php-cs-fixer (v2.0.0 => v2.1.1)
  - Updating sensio/generator-bundle (v3.1.2 => v3.1.3)
  - Updating symfony/phpunit-bridge (v3.2.3 => v3.2.5)
  - Updating sensiolabs/security-checker (v4.0.0 => v4.0.2)
```

Commits
-------

6a5a79f Updated dependencies to Symfony 3.2.5

Author: javiereguiluz