Merge branch '2.7' into 2.8

* 2.7:
  Use PHPUnit 6.0 on PHP 7.* test lines

Author: nicolas-grekas

composer.json

@@ -24,7 +24,7 @@
         "symfony/event-dispatcher": "~2.8|~3.0.0",
         "symfony/finder": "^2.0.5|~3.0.0",
         "symfony/http-foundation": "~2.7",
-        "symfony/http-kernel": "^2.8.16",
+        "symfony/http-kernel": "^2.8.18",
         "symfony/polyfill-mbstring": "~1.0",
         "symfony/filesystem": "~2.3|~3.0.0",
         "symfony/routing": "^2.8.17",
@@ -43,7 +43,7 @@
         "symfony/dom-crawler": "^2.0.5|~3.0.0",
         "symfony/polyfill-intl-icu": "~1.0",
         "symfony/security": "~2.6|~3.0.0",
-        "symfony/form": "^2.8.16",
+        "symfony/form": "^2.8.18",
         "symfony/expression-language": "~2.6|~3.0.0",
         "symfony/process": "^2.0.5|~3.0.0",
         "symfony/validator": "~2.5|~3.0.0",