Merge branch '2.8'

* 2.8:
  Fix undefined array $server
  Fix call to undefined function json_last_error_message
  Fix bug in windows detection
  [ProxyManager] Tmp fix composer reqs issue in ZF
  Fix PropertyInfo extractor namespace in framework bundle
  Add missing exclusions from phpunit.xml.dist
  [Serializer] ObjectNormalizer: don't serialize static methods and props
  [Form] Enhance some FormRegistry deprecation messages
  [Validator] [sl] BIC (SWIFT-BIC) validation constraint
  [WebProfilerBundle] correct typo in show stack trace link
  bumped Symfony version to 2.8.0
  updated VERSION for 2.8.0-BETA1
  updated CHANGELOG for 2.8.0-BETA1
  Fix the server variables in the router_*.php files
  [Validator] Allow an empty path with a non empty fragment or a query
  The following change adds support for Armenian pluralization.
  [2.3][Process] fix Proccess run with pts enabled

Conflicts:
	src/Symfony/Bridge/ProxyManager/composer.json
	src/Symfony/Bundle/FrameworkBundle/DependencyInjection/Compiler/FormPass.php
	src/Symfony/Component/Form/FormRegistry.php

Author: nicolas-grekas