Issue #2088651 by pwolanin: Update symfony components to latest 2.3.*.

composer.lock

core/vendor/autoload.php

core/vendor/composer/autoload_classmap.php

core/vendor/composer/autoload_files.php

core/vendor/composer/autoload_namespaces.php

core/vendor/composer/autoload_real.php

core/vendor/composer/include_paths.php

core/vendor/composer/installed.json

...ony/class-loader/Symfony/Component/ClassLoader/.gitignore

...lass-loader/Symfony/Component/ClassLoader/ClassLoader.php

...or/symfony/debug/Symfony/Component/Debug/ErrorHandler.php

...mfony/Component/Debug/Exception/ContextErrorException.php

.../debug/Symfony/Component/Debug/Tests/ErrorHandlerTest.php

...njection/Symfony/Component/DependencyInjection/.gitignore

...encyInjection/Compiler/ResolveDefinitionTemplatesPass.php

...ction/Symfony/Component/DependencyInjection/Container.php

...ony/Component/DependencyInjection/DefinitionDecorator.php

...ymfony/Component/DependencyInjection/Dumper/PhpDumper.php

...pendencyInjection/LazyProxy/PhpDumper/DumperInterface.php

...nt/DependencyInjection/LazyProxy/PhpDumper/NullDumper.php