Merge branch '2.8'

* 2.8: (27 commits)
  [2.8] Fix 3.0 incompatible deps
  [HttpKernel] Fix lowest dep
  [Security] fix check for empty usernames
  [Form] updated exception message of ButtonBuilder::setRequestHandler()
  [travis] Fix deps=high jobs
  Fix typo 'assets.package' => 'assets.packages' in UPGRADE-2.7
  [Serializer] Simplify AbstractNormalizer::prepareForDenormalization()
  [HttpFoundation] [PSR-7] Allow to use resources as content body and to return resources from string content
  [DependencyInjection] Forbid container cloning
  [HttpFoundation] Fix Response::closeOutputBuffers() for HHVM 3.3
  [WebProfilerBundle] Add link to show profile of latest request
  [DependencyInjection] Remove unused code in XmlFileLoader
  [HttpFoundation] Behaviour change in PHP7 for substr
  [Console] Set QuestionHelper max attempts in tests
  [Form] Fix a BC break in the entity
  fix broken ChoiceQuestion
  bumped Symfony version to 2.7.3
  updated VERSION for 2.7.2
  updated CHANGELOG for 2.7.2
  bumped Symfony version to 2.6.11
  ...

Conflicts:
	.travis.yml
	CHANGELOG-2.3.md
	CHANGELOG-2.6.md
	CHANGELOG-2.7.md
	UPGRADE-2.7.md
	src/Symfony/Bridge/Twig/composer.json
	src/Symfony/Bundle/FrameworkBundle/Tests/Console/Descriptor/AbstractDescriptorTest.php
	src/Symfony/Bundle/FrameworkBundle/composer.json
	src/Symfony/Bundle/SecurityBundle/composer.json
	src/Symfony/Component/Form/composer.json
	src/Symfony/Component/HttpKernel/composer.json

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