* 2.3:
[travis] timeout the sigchild tests at 60s
CS: Single line comments should use double slashes (//) and not hash (#).
Do not use HttpKernel Extension when not needed
bumped Symfony version to 2.3.37
updated VERSION for 2.3.36
update CONTRIBUTORS for 2.3.36
updated CHANGELOG for 2.3.36
use nowdoc instead of heredoc
Conflicts:
src/Symfony/Bundle/FrameworkBundle/Command/ConfigDumpReferenceCommand.php
src/Symfony/Bundle/FrameworkBundle/Command/RouterApacheDumperCommand.php
src/Symfony/Bundle/FrameworkBundle/Command/RouterMatchCommand.php
src/Symfony/Bundle/FrameworkBundle/Translation/Translator.php
src/Symfony/Bundle/TwigBundle/Command/LintCommand.php
src/Symfony/Component/Config/Tests/Definition/Dumper/YamlReferenceDumperTest.php
src/Symfony/Component/Debug/ExceptionHandler.php
src/Symfony/Component/HttpKernel/Kernel.php
src/Symfony/Component/Routing/Generator/Dumper/PhpGeneratorDumper.php
To keep language consistent, three methods were changed in InputOption:
* `InputOption::acceptParameter()` -> `InputOption::acceptValue()`
* `InputOption::isParameterRequired()` -> InputOption::isValueRequired()`
* `InputOption::isParameterOptional()` -> `InputOption::isValueOptional()`
The InputDefinition::asXml() method was also modified to update the `accept_value` and `is_value_required` attributes.