Merge branch '2.7' into 2.8

* 2.7:
  [2.3][Component/Security] Fixed phpdoc in AnonymousToken constructor for user param
  prevent calling get() for service_container service
  call get() after the container was compiled
  Fixed readme of OptionsResolver
  [DependencyInjection] Suggest ExpressionLanguage in composer.json

Author: fabpot

composer.json

@@ -29,6 +29,7 @@
     "suggest": {
         "symfony/yaml": "",
         "symfony/config": "",
+        "symfony/expression-language": "For using expressions in service container configuration",
         "symfony/proxy-manager-bridge": "Generate service proxies to lazy load them"
     },
     "autoload": {