[Doc] Use Markdown syntax highlighting
Merge branch '2.3' into 2.5

* 2.3:
  [Doc] Use Markdown syntax highlighting
  [Finder] tweaked docs
  [Finder] Add info about possibilities offered by SplFileInfo
  fix components tests
  [Intl] FIxed failing test
  [Intl] Generated the data for ICU version 54-rc
  [EventDispatcher] fix doc bloc on EventDispatcherInterface
  [Validator] Update validators.zh_CN.xlf, fix translation error
  bumped Symfony version to 2.3.21
  updated VERSION for 2.3.20
  update CONTRIBUTORS for 2.3.20
  updated CHANGELOG for 2.3.20
  [Intl] Integrated ICU data into Intl component

Conflicts:
	src/Symfony/Component/HttpKernel/Kernel.php
	src/Symfony/Component/Intl/ResourceBundle/LocaleBundle.php
Docblock fixes
Merge branch '2.3' into 2.5

* 2.3:
  Configure firewall's kernel exception listener with configured entry point or a default entry point
  PSR-2 fixes
  [DependencyInjection] make paths relative to __DIR__ in the generated container
  Fixed the syntax of a composer.json file
  Fixed the symfony/config version constraint
  Tweaked the password-compat version constraint
  Docblock fixes
  define constant only if it wasn't defined before
  Fix incorrect spanish translation
  Fixed typos

Conflicts:
	composer.json
	src/Symfony/Bridge/Twig/TwigEngine.php
	src/Symfony/Bundle/FrameworkBundle/Controller/Controller.php
	src/Symfony/Bundle/FrameworkBundle/Templating/Loader/FilesystemLoader.php
	src/Symfony/Bundle/FrameworkBundle/composer.json
	src/Symfony/Component/Console/Descriptor/MarkdownDescriptor.php
	src/Symfony/Component/Console/Helper/TableHelper.php
	src/Symfony/Component/Console/Tests/Helper/HelperSetTest.php
	src/Symfony/Component/Debug/ErrorHandler.php
	src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
	src/Symfony/Component/Finder/Tests/Iterator/RecursiveDirectoryIteratorTest.php
	src/Symfony/Component/Form/Tests/Extension/Core/DataMapper/PropertyPathMapperTest.php
	src/Symfony/Component/HttpFoundation/Response.php
	src/Symfony/Component/HttpFoundation/StreamedResponse.php
	src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php
	src/Symfony/Component/HttpKernel/Controller/ControllerResolverInterface.php
	src/Symfony/Component/HttpKernel/Debug/TraceableEventDispatcher.php
	src/Symfony/Component/HttpKernel/Fragment/RoutableFragmentRenderer.php
	src/Symfony/Component/HttpKernel/Tests/DataCollector/RequestDataCollectorTest.php
	src/Symfony/Component/Intl/NumberFormatter/NumberFormatter.php
	src/Symfony/Component/Process/Process.php
	src/Symfony/Component/Process/Tests/AbstractProcessTest.php
	src/Symfony/Component/PropertyAccess/PropertyAccessorBuilder.php
	src/Symfony/Component/Routing/Tests/Fixtures/validpattern.php
	src/Symfony/Component/Security/Http/RememberMe/TokenBasedRememberMeServices.php
	src/Symfony/Component/Security/composer.json
	src/Symfony/Component/Serializer/Encoder/XmlEncoder.php
	src/Symfony/Component/Serializer/Normalizer/GetSetMethodNormalizer.php
	src/Symfony/Component/Stopwatch/StopwatchEvent.php
	src/Symfony/Component/Stopwatch/StopwatchPeriod.php
	src/Symfony/Component/Templating/PhpEngine.php
	src/Symfony/Component/Templating/TemplateReference.php
	src/Symfony/Component/Templating/TemplateReferenceInterface.php
	src/Symfony/Component/Translation/TranslatorInterface.php
	src/Symfony/Component/Validator/ConstraintViolation.php
	src/Symfony/Component/Validator/ExecutionContextInterface.php
	src/Symfony/Component/Validator/Mapping/ClassMetadata.php
	src/Symfony/Component/Validator/MetadataFactoryInterface.php
[Tests] Silenced all deprecations in tests for 2.3
Merge branch '2.3' into 2.5

* 2.3:
  [Config] adds missing « use » statement for InvalidTypeException type hint in documentation.
  [Config] fixes broken unit test on ArrayNode class.
  fixed CS
  [Security] Delete old session on auth strategy migrate
  update required minimum TwigBridge version
  Very minor grammar fix in error message
  [Tests] Silenced all deprecations in tests for 2.3
  BinaryFileResponse - add missing newline
  fixed CS
  add a limit and a test to FlattenExceptionTest.
  CS: There should be no empty lines following phpdocs
  [FrameworkBundle] fix cache:clear command
  [2.3] Docblocks should not be followed by a blank line
  Fix return phpdoc
  [PropertyAccess] Added test to verify #5775 is fixed

Conflicts:
	src/Symfony/Bundle/TwigBundle/composer.json
	src/Symfony/Component/PropertyAccess/Tests/PropertyAccessorTest.php
	src/Symfony/Component/Security/Core/Tests/Validator/Constraints/UserPasswordValidatorTest.php
Merge branch '2.5' into 2.6

* 2.5:
  [Config] adds missing « use » statement for InvalidTypeException type hint in documentation.
  [Config] fixes broken unit test on ArrayNode class.
  fixed CS
  [Security] Delete old session on auth strategy migrate
  update required minimum TwigBridge version
  Very minor grammar fix in error message
  [Tests] Silenced all deprecations in tests for 2.3
  BinaryFileResponse - add missing newline
  fixed CS
  add a limit and a test to FlattenExceptionTest.
  CS: There should be no empty lines following phpdocs
  [FrameworkBundle] fix cache:clear command
  [2.3] Docblocks should not be followed by a blank line
  Fix return phpdoc
  [PropertyAccess] Added test to verify #5775 is fixed