Merge branch '2.7' into 2.8

* 2.7:
  Fix undefined array $server
  Fix bug in windows detection
  [ProxyManager] Tmp fix composer reqs issue in ZF
  Add missing exclusions from phpunit.xml.dist
  [Serializer] ObjectNormalizer: don't serialize static methods and props
  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:
	composer.json
	src/Symfony/Bridge/ProxyManager/composer.json
	src/Symfony/Component/Security/phpunit.xml.dist

Author: nicolas-grekas