Merge branch '2.8'

* 2.8: (42 commits)
  [DoctrineBridge] Bypass the db when no valid identifier is provided in ORMQueryBuilderLoader
  [Serializer] Fixed typo in comment
  [Form] Fixed: Filter non-integers when selecting entities by int ID
  [Form] [EventListener] fixed sending non array data on submit to ResizeListener
  Fix merge
  Fix merge
  Add test for HHVM FatalErrors
  [2.6][Debug] Fix fatal-errors handling on HHVM
  [Debug] Fix log level of stacked errors
  [Form] Deprecated "cascade_validation"
  [Form] Add "prototype_data" option to collection type
  [VarDumper] Fix uninitialized id in HtmlDumper
  [Form] Added the 'range' FormType
  Fixed fluent interface
  [Console] Fix tests on Windows
  [2.7] Fix unsilenced deprecation notices
  [2.3][Debug] Fix fatal-errors handling on HHVM
  [Debug] fix debug class loader case test on windows
  Standardize the name of the exception variables
  [Debug+VarDumper] Fix handling of PHP7 exception/error model
  ...

Conflicts:
	CHANGELOG-2.7.md
	UPGRADE-2.7.md
	UPGRADE-2.8.md
	src/Symfony/Bridge/Twig/AppVariable.php
	src/Symfony/Component/Console/Helper/DialogHelper.php
	src/Symfony/Component/Debug/ErrorHandler.php
	src/Symfony/Component/Debug/Tests/ErrorHandlerTest.php
	src/Symfony/Component/DependencyInjection/Compiler/ResolveParameterPlaceHoldersPass.php
	src/Symfony/Component/Form/AbstractType.php
	src/Symfony/Component/Form/AbstractTypeExtension.php
	src/Symfony/Component/HttpKernel/Tests/DependencyInjection/ContainerAwareHttpKernelTest.php
	src/Symfony/Component/HttpKernel/Tests/Logger.php
	src/Symfony/Component/PropertyAccess/Exception/UnexpectedTypeException.php
	src/Symfony/Component/Routing/Route.php

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