Indicate which file was being parsed if an exception is thrown while running translation:debug

When running the translation:debug command, if a template contains invalid twig markup,
an exception is thrown. This patch rethrows a new exception that includes the filename
being parsed in the message to aid debuging.
[TwigBundle] added a test
added missing files
Merge branch '2.3' into 2.5

* 2.3:
  added missing files
  [TwigBundle] added a test
  Indicate which file was being parsed if an exception is thrown while running translation:debug
  [ClassLoader] Cast $useIncludePath property to boolean
  [HttpFoundation] Minor spelling fix in PHPDocs
  improve error message for multiple documents
  [Session] remove invalid workaround in session regenerate
  [Kernel] ensure session is saved before sending response
  [Routing] serialize the compiled route to speed things up
  [Validator] Fixed Regex::getHtmlPattern() to work with complex and negated patterns
  [DependencyInjection] use inheritdoc for loaders
  [Config] fix filelocator with empty name
  [Form] fix form handling with unconventional request methods like OPTIONS
  CSRF warning docs on Request::enableHttpMethodParameterOverride()

Conflicts:
	src/Symfony/Component/Routing/Route.php