Merge branch '2.3' into 2.7

* 2.3:
  Fix undefined array $server
  [ProxyManager] Tmp fix composer reqs issue in ZF
  Add missing exclusions from phpunit.xml.dist
  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/Bundle/DebugBundle/phpunit.xml.dist
	src/Symfony/Component/Security/phpunit.xml.dist

Author: nicolas-grekas