Merge branch '2.7'

* 2.7: (22 commits)
  Php Inspections (EA Extended): squash all PR-13813 commits
  replaced the last remaining is_integer() call
  [2.3] [Config] [Console] [DependencyInjection] [DomCrawler] [Form] [HttpKernel] [PropertyAccess] [Security] [Translation] [Yaml] static code analysis, code cleanup
  [FrameworkBundle] simplify dep declaration
  [VarDumper] Fix "next element is already occupied"
  [Serializer] Introduce ObjectNormalizer
  [Serializer] Refactoring of metadata
  [Validator] Added missing galician (gl) translations
  [WebProfilerBundle] Update ajax calls in toolbar to add the css error class
  [PropertyAccess] stop overwriting once a reference is reached (3rd)
  [OptionsResolver] Remove Unused Variable from Foreach Cycles
  [travis] Tests Security sub-components
  [Serializer] Test that normalizers ignore non-existing attributes.
  [Twig] bootstrap_3_layout.html.twig is usable as a trait
  [travis] Tests Security sub-components
  [Serializer] Fix ClassMetadataFactory PHPDoc
  CS fixes
  [Serializer] rename exception interface
  [Serializer] Optimize GetSetMethodNormalizer and PropertyNormalizer
  [TwigBridge] Bootstrap Layout - Fix the label of checkbox cannot be empty
  ...

Conflicts:
	src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Configuration.php
	src/Symfony/Component/Console/Tests/Helper/LegacyDialogHelperTest.php
	src/Symfony/Component/Serializer/composer.json

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