minor #449 Updated dependencies to Symfony 3.2.3 (javiereguiluz)

This PR was merged into the master branch.

Discussion
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Updated dependencies to Symfony 3.2.3

```
  - Updating symfony/symfony (v3.2.2 => v3.2.3)
  - Updating doctrine/dbal (v2.5.6 => v2.5.11)
  - Updating doctrine/doctrine-bundle (1.6.6 => 1.6.7)
  - Updating sensio/framework-extra-bundle (v3.0.19 => v3.0.21)
  - Updating sebastian/comparator (1.2.2 => 1.2.4)
  - Updating phpunit/phpunit (4.8.31 => 4.8.35)
  - Updating symfony/phpunit-bridge (v3.2.2 => v3.2.3)
```

Commits
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73fae63 Updated dependencies to Symfony 3.2.3

Author: javiereguiluz