Improved a help note about event subscribers

minor symfony#410 Fixed tests on Windows systems (javiereguiluz)

This PR was squashed before being merged into the master branch (closes symfony#410).

Discussion
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Fixed tests on Windows systems

Trying to fix the AppVeyor issues by reusing Symfony's `appveyor.yml` file.

Commits
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274a5eb Fixed tests on Windows systems

feature symfony#405 Upgraded the application to Symfony 3.2.0 (javier…

…eguiluz)

This PR was squashed before being merged into the master branch (closes symfony#405).

Discussion
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Upgraded the application to Symfony 3.2.0

Commits
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13b1eb8 Upgraded the application to Symfony 3.2.0

minor symfony#400 Updated some help notes for parameters.yml.dist (ja…

…viereguiluz)

This PR was merged into the master branch.

Discussion
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Updated some help notes for parameters.yml.dist

* Short params have been moved at the top of the file because `env(DATABASE_URL)` is too long and hides them
* `env(SYMFONY_LOG)` value is now wrapped in quotes to avoid deprecations
* Simplified `env(SYMFONY_SECRET)` description
* Commented the params related to the mailer (because the mailer is already disabled in the application)

Commits
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d44b8fe Updated some help notes for parameters.yml.dist

feature symfony#385 Updated to Symfony 3.1.5 (javiereguiluz)

This PR was merged into the master branch.

Discussion
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Updated to Symfony 3.1.5

Full composer update log:

```
  - Removing twig/twig (v1.25.0)
  - Installing twig/twig (v1.26.1)

  - Removing symfony/symfony (v3.1.4)
  - Installing symfony/symfony (v3.1.5)

  - Removing psr/log (1.0.0)
  - Installing psr/log (1.0.1)

  - Removing doctrine/dbal (v2.5.4)
  - Installing doctrine/dbal (v2.5.5)

  - Removing doctrine/orm (v2.5.4)
  - Installing doctrine/orm (v2.5.5)

  - Removing sensiolabs/security-checker (v3.0.2)
  - Installing sensiolabs/security-checker (v4.0.0)

  - Removing sensio/distribution-bundle (v5.0.9)
  - Installing sensio/distribution-bundle (v5.0.13)

  - Removing twig/extensions (v1.3.0)
  - Installing twig/extensions (v1.4.0)

  - Removing symfony/phpunit-bridge (v3.1.4)
  - Installing symfony/phpunit-bridge (v3.1.5)

  - Removing phpdocumentor/reflection-docblock (3.1.0)
  - Installing phpdocumentor/reflection-docblock (3.1.1)
```

Commits
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52e6824 Updated to Symfony 3.1.5

Added a help note about why it's the password/username hardcoded

feature symfony#350 Use new php features (voronkovich)

This PR was squashed before being merged into the master branch (closes symfony#350).

Discussion
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Use new php features

See symfony#346

Commits
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055fc88 Use new php features

feature symfony#328 Replaced KnpPaginator by PagerFanta (javiereguiluz)

This PR was squashed before being merged into the master branch (closes symfony#328).

Discussion
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Replaced KnpPaginator by PagerFanta

This fixes symfony#305.

Commits
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df26404 Replaced KnpPaginator by PagerFanta

feature symfony#323 Make the retrieval of template source compatible …

…with Twig 2 (stof)

This PR was merged into the master branch.

Discussion
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Make the retrieval of template source compatible with Twig 2

Closes symfony#322

Commits
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6f2109d Make the retrieval of template source compatible with Twig 2

minor symfony#311 Use non-deprecated APC validator and serializer ser…

…vice names (bocharsky-bw)

This PR was merged into the master branch.

Discussion
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Use non-deprecated APC validator and serializer service names

According to the symfony/symfony-standard#901 .

Commits
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ffd6aea Use non-deprecated APC validator and serializer service names