minor #1300 Replace binary gender examples with something that is actually single-choice (igorwwwwwwwwwwwwwwwwwwww)

This PR was merged into the 1.3 branch.

Discussion
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Replace binary gender examples with something that is actually single-choice

In order to include people who do not fit into the gender binary, gender fields really should be a free-form text field. As such, this patch changes the `choices` example to use a billing plan instead.

# References

* http://gender.wikia.com/wiki/Non-binary
* https://en.wikipedia.org/wiki/Genderqueer
* https://modelviewculture.com/pieces/the-argument-for-free-form-input
* https://www.facebook.com/

Commits
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0e336e53 Replace binary gender examples with something that is actually single-choice

In order to include people who do not fit into the gender binary, gender fields really should be a free-form text field. As such, this patch changes the `choices` example to use a billing plan instead.

# References

* http://gender.wikia.com/wiki/Non-binary
* https://en.wikipedia.org/wiki/Genderqueer
* https://modelviewculture.com/pieces/the-argument-for-free-form-input
* https://www.facebook.com/

This PR was merged into the 1.3 branch.

Discussion
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Add hint to install browser-kit to use WebTestCase

`Silex/WebTestCase` have a requirement for `symfony/browser-kit`.
This PR give instructions to the developer when PHPUnit is run and this dependency is missing.

Before:
```
PHP Fatal error:  Class 'Symfony\Component\BrowserKit\Client' not found in vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Client.php on line 32
PHP Stack trace:
PHP   1. {main}() /usr/bin/phpunit:0
PHP   2. PHPUnit_TextUI_Command::main() /usr/bin/phpunit:547
PHP   3. PHPUnit_TextUI_Command->run() phar:///usr/bin/phpunit/phar/phpunit/TextUI/Command.php:100
PHP   4. PHPUnit_TextUI_TestRunner->doRun() phar:///usr/bin/phpunit/phar/phpunit/TextUI/Command.php:148
PHP   5. PHPUnit_Framework_TestSuite->run() phar:///usr/bin/phpunit/phar/phpunit/TextUI/TestRunner.php:432
PHP   6. PHPUnit_Framework_TestCase->run() phar:///usr/bin/phpunit/phar/phpunit/Framework/TestSuite.php:735
PHP   7. PHPUnit_Framework_TestResult->run() phar:///usr/bin/phpunit/phar/phpunit/Framework/TestCase.php:702
PHP   8. PHPUnit_Framework_TestCase->runBare() phar:///usr/bin/phpunit/phar/phpunit/Framework/TestResult.php:601
PHP   9. PHPUnit_Framework_TestCase->runTest() phar:///usr/bin/phpunit/phar/phpunit/Framework/TestCase.php:746
PHP  10. ReflectionMethod->invokeArgs() phar:///usr/bin/phpunit/phar/phpunit/Framework/TestCase.php:881
```

After:
```
There was 1 error:

1) FunctionalTest::testAction
LogicException: Component "symfony/browser-kit" is required by WebTestCase.
Run composer require symfony/browser-kit

vendor/silex/silex/src/Silex/WebTestCase.php:59
tests/FunctionalTest.php:14
```

Resolves #1293

Commits
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633cd437 Add hint to install browser-kit to use WebTestCase

Refs #1293

This PR was submitted for the master branch but it was merged into the 1.3 branch instead (closes #1284).

Discussion
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fix typo

Commits
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21ae66cd fix typo

This PR was submitted for the master branch but it was merged into the 1.3 branch instead (closes #1283).

Discussion
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fix typo

Commits
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6d0944dd fix typo

This PR was submitted for the master branch but it was merged into the 1.3 branch instead (closes #1282).

Discussion
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fix typo

Commits
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e9adcdf5 fix typo

This PR was merged into the 1.3 branch.

Discussion
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[README] Fixed the minimal PHP version

Fixes #1279

Commits
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0a93a776 [README] Fixed the minimal PHP version

This PR was merged into the 1.3 branch.

Discussion
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fixes some routing deprecation notices

Commits
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28ff0034 fixes some routing deprecation notices

This PR was merged into the 1.3 branch.

Discussion
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Fix comment about symfony version

Form FQCN are introduced with symfony 2.8.

Commits
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ff161a9a Fix comment about symfony version

Form FQCN are introduced with symfony 2.8.

This PR was squashed before being merged into the 1.3 branch (closes #1269).

Discussion
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Minor doc tweaks and fixes

This past weekend I reviewed the entire doc for 1.3 version and this PR contains tweaks and fixes. If you don't agree with some change, tell me and I'll revert it.

Commits
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bcc1a45a Minor doc tweaks and fixes

This PR was submitted for the master branch but it was merged into the 1.3 branch instead (closes #1266).

Discussion
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Fix error never removed from session in SecurotyProvider

When $message is different than the $error variable, the wrong session key is deleted.

Commits
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2509b5ac Fix error never removed from session in SecurotyProvider

When $message is different than the $error variable, the wrong session key is deleted.

This PR was merged into the 1.3 branch.

Discussion
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fixed validator test

Commits
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3dd1b157 fixed validator test

This PR was merged into the 1.3 branch.

Discussion
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fixed translation registration for the validators

fixes #1241

Commits
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4f560c9f fixed translation registration for the validators

This PR was merged into the 1.3 branch.

Discussion
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fixed deprecation notices

Thanks @nicolas-grekas, that's ugly as I anticipated :(

Commits
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67d47190 fixed deprecation notices

This PR was merged into the 1.3 branch.

Discussion
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Fixed not explicitly declared properties

Commits
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b61f087c Fixed not explicitly declared properties

This PR was merged into the 1.3 branch.

Discussion
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Added Symfony 3.0 in Travis

Commits
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5aa17969 allowed Twig 2.0
dc97b3ab allowed Symfony 3.0
436aded5 simplifed composer.json