added XSD to PHPUnit configuration
removed defaults from PHPUnit configuration
Merge branch '2.3' into 2.4

* 2.3:
  bumped Symfony version to 2.3.18
  updated VERSION for 2.3.17
  update CONTRIBUTORS for 2.3.17
  updated CHANGELOG for 2.3.17
  added XSD to PHPUnit configuration
  bug #11319 [HttpKernel] Ensure the storage exists before purging it in ProfilerTest
  [Translation] Added unescaping of ids in PoFileLoader
  updated italian translation for validation messages
  [DomCrawler] Fix docblocks and formatting.
  [DomCrawler] Remove the query string and the anchor of the uri of a link
  Simplified the Travis test command
  [Console] Make sure formatter is the same

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
Merge branch '2.4' into 2.5

* 2.4:
  updated VERSION for 2.4.7
  updated CHANGELOG for 2.4.7
  bumped Symfony version to 2.3.18
  updated VERSION for 2.3.17
  update CONTRIBUTORS for 2.3.17
  updated CHANGELOG for 2.3.17
  added XSD to PHPUnit configuration
  add missing docblock for ProcessBuilder::addEnvironmentVariables()
  bug #11319 [HttpKernel] Ensure the storage exists before purging it in ProfilerTest
  [Translation] Added unescaping of ids in PoFileLoader
  updated italian translation for validation messages
  [DomCrawler] Fix docblocks and formatting.
  [DomCrawler] Remove the query string and the anchor of the uri of a link
  Simplified the Travis test command
  Remove Expression Language services when the component is unavailable
  [Console] Make sure formatter is the same

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
Merge branch '2.5'

* 2.5:
  updated VERSION for 2.4.7
  updated CHANGELOG for 2.4.7
  bumped Symfony version to 2.3.18
  updated VERSION for 2.3.17
  update CONTRIBUTORS for 2.3.17
  updated CHANGELOG for 2.3.17
  added XSD to PHPUnit configuration
  fix the return types
  add missing docblock for ProcessBuilder::addEnvironmentVariables()
  bug #11319 [HttpKernel] Ensure the storage exists before purging it in ProfilerTest
  [Translation] Added unescaping of ids in PoFileLoader
  updated italian translation for validation messages
  [DomCrawler] Fix docblocks and formatting.
  [DomCrawler] Remove the query string and the anchor of the uri of a link
  Simplified the Travis test command
  Remove Expression Language services when the component is unavailable
  Added SK translations
  [Console] Make sure formatter is the same
Merge branch '2.3' into 2.4

* 2.3:
  fixed CS
  [HttpFoundation] Remove content-related headers if content is empty
  removed defaults from PHPUnit configuration
Merge branch '2.4' into 2.5

* 2.4:
  added missing test
  fixed CS
  [HttpFoundation] Remove content-related headers if content is empty
  bumped Symfony version to 2.4.8
  removed defaults from PHPUnit configuration

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
Merge branch '2.5'

* 2.5:
  added missing test
  fixed CS
  [HttpFoundation] Remove content-related headers if content is empty
  bumped Symfony version to 2.5.2
  bumped Symfony version to 2.4.8
  updated VERSION for 2.5.1
  updated CHANGELOG for 2.5.1
  removed defaults from PHPUnit configuration

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
Changed order of validation
[OptionsResolver] Added a light-weight, low-level API for basic option resolving
fixed CS
Merge branch '2.3' into 2.4

* 2.3:
  fixed CS
  [Process] fixed some volatile tests
  [HttpKernel] fixed a volatile test
  [HttpFoundation] fixed some volatile tests
  Use getPathname() instead of string casting to get BinaryFileReponse file path

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
	src/Symfony/Bundle/FrameworkBundle/Command/ContainerDebugCommand.php
	src/Symfony/Bundle/FrameworkBundle/EventListener/SessionListener.php
	src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/FrameworkExtensionTest.php
	src/Symfony/Component/ClassLoader/Tests/ApcUniversalClassLoaderTest.php
	src/Symfony/Component/Config/Definition/ReferenceDumper.php
	src/Symfony/Component/Config/Tests/Definition/Dumper/YamlReferenceDumperTest.php
	src/Symfony/Component/Console/Application.php
	src/Symfony/Component/Console/Tests/ApplicationTest.php
	src/Symfony/Component/Filesystem/Exception/IOException.php
	src/Symfony/Component/Form/Extension/Templating/TemplatingExtension.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/NumberToLocalizedStringTransformerTest.php
	src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
	src/Symfony/Component/HttpKernel/Tests/Bundle/BundleTest.php
	src/Symfony/Component/HttpKernel/Tests/Fragment/RoutableFragmentRendererTest.php
	src/Symfony/Component/HttpKernel/Tests/Profiler/Mock/RedisMock.php
	src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
	src/Symfony/Component/PropertyAccess/PropertyAccessor.php
	src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorCollectionTest.php
	src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
	src/Symfony/Component/Routing/Matcher/Dumper/ApacheMatcherDumper.php
	src/Symfony/Component/Routing/Tests/Annotation/RouteTest.php
	src/Symfony/Component/Routing/Tests/Loader/AnnotationClassLoaderTest.php
	src/Symfony/Component/Serializer/Encoder/XmlEncoder.php
	src/Symfony/Component/Validator/Constraints/CollectionValidator.php
	src/Symfony/Component/Validator/Tests/ExecutionContextTest.php
Merge branch '2.4' into 2.5

* 2.4:
  fixed CS
  [Process] fixed some volatile tests
  [HttpKernel] fixed a volatile test
  [HttpFoundation] fixed some volatile tests
  [Tests] PHPUnit Optimizations
  Use getPathname() instead of string casting to get BinaryFileReponse file path

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/Fixtures/php/full.php
	src/Symfony/Bundle/FrameworkBundle/Tests/Functional/Bundle/TestBundle/Controller/SessionController.php
	src/Symfony/Component/ClassLoader/Tests/ApcUniversalClassLoaderTest.php
	src/Symfony/Component/Console/Formatter/OutputFormatterStyle.php
	src/Symfony/Component/HttpKernel/DataCollector/LoggerDataCollector.php
	src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
	src/Symfony/Component/HttpKernel/Tests/DataCollector/LoggerDataCollectorTest.php
	src/Symfony/Component/HttpKernel/Tests/DataCollector/RequestDataCollectorTest.php
	src/Symfony/Component/HttpKernel/Tests/Debug/TraceableEventDispatcherTest.php
	src/Symfony/Component/Process/Tests/AbstractProcessTest.php
	src/Symfony/Component/Routing/Matcher/Dumper/PhpMatcherDumper.php
	src/Symfony/Component/Routing/Tests/Generator/UrlGeneratorTest.php
	src/Symfony/Component/Security/Acl/Dbal/MutableAclProvider.php
	src/Symfony/Component/Security/Core/Authentication/Provider/PreAuthenticatedAuthenticationProvider.php
	src/Symfony/Component/Security/Http/Tests/Firewall/SwitchUserListenerTest.php
	src/Symfony/Component/Serializer/Tests/Normalizer/GetSetMethodNormalizerTest.php
	src/Symfony/Component/Translation/Tests/Dumper/IcuResFileDumperTest.php
	src/Symfony/Component/Validator/Constraints/ChoiceValidator.php
	src/Symfony/Component/Validator/Constraints/CollectionValidator.php
	src/Symfony/Component/Validator/Tests/Constraints/AbstractConstraintValidatorTest.php
	src/Symfony/Component/Validator/Tests/Constraints/IsbnValidatorTest.php
	src/Symfony/Component/Validator/Tests/ValidationVisitorTest.php
	src/Symfony/Component/Yaml/Parser.php
Merge branch '2.5'

* 2.5:
  added missing use statements
  added missing use statement
  added missing use statement
  fixed CS
  [Process] fixed some volatile tests
  [HttpKernel] fixed a volatile test
  [HttpFoundation] fixed some volatile tests
  [Tests] PHPUnit Optimizations
  Use getPathname() instead of string casting to get BinaryFileReponse file path

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/Tests/DependencyInjection/ConfigurationTest.php
	src/Symfony/Bundle/TwigBundle/Tests/DependencyInjection/Fixtures/php/full.php
	src/Symfony/Component/Debug/Tests/Exception/FlattenExceptionTest.php
	src/Symfony/Component/HttpFoundation/Tests/BinaryFileResponseTest.php
	src/Symfony/Component/Process/Process.php
	src/Symfony/Component/Stopwatch/Stopwatch.php
	src/Symfony/Component/Validator/Constraints/AbstractComparisonValidator.php
	src/Symfony/Component/Validator/Tests/Constraints/GreaterThanOrEqualValidatorTest.php
	src/Symfony/Component/Yaml/Parser.php
	src/Symfony/Component/Yaml/Tests/InlineTest.php
feature #11716 [OptionsResolver] Added a light-weight, low-level API for basic option resolving (webmozart)

This PR was merged into the 2.6-dev branch.

Discussion
----------

[OptionsResolver] Added a light-weight, low-level API for basic option resolving

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11705
| License       | MIT
| Doc PR        | symfony/symfony-docs#4159

See [the updated documentation](https://github.com/webmozart/symfony-docs/blob/issue11705/components/options_resolver.rst) for details on the usage of the simple API.

The most important motivation for this change is DX and speed. The basic features of the component should be easily usable in a wide variety of use cases without impacting performance.

For DX reasons, I added the static methods to the `Options` class, which makes the code concise and easy to read and understand:

```php
use Symfony\Component\OptionsResolver\Options;

$options = Options::validateRequired($options, 'format');

$options = Options::validateTypes($options, array(
    'format' => array('string', 'int'),
    'calendar' => 'int',
));

$options = Options::validateValues($options, array(
    'calendar' => array(
        \IntlDateFormatter::GREGORIAN,
        \IntlDateFormatter::TRADITIONAL,
    ),
));

$options = Options::resolve($options, array(
    'format' => null,
    'calendar' => \IntlDateFormatter::GREGORIAN,
));
```

If you need to distribute the option configuration, this PR also extracts the configuration part of the `OptionsResolver` class into a new class `OptionsConfig`, which can be passed around. When the configuration is complete, pass the config object to `Options::resolve()` as second argument:

```php
$config = new OptionsConfig();

$config->setDefaults(array(
    'format' => \IntlDateFormatter::MEDIUM,
    'calendar' => \IntlDateFormatter::GREGORIAN,
));

$options = Options::resolve($options, $config);
```

Consequently - since `OptionsResolver` extends `OptionsConfig` - the two following statements now become identical:

```php
$options = $resolver->resolve($options);
$options = Options::resolve($options, $resolver);
```

Commits
-------

9066025 [OptionsResolver] Added a light-weight, low-level API for basic option resolving
fixed typo