Merge branch '3.4'

* 3.4:
  Allow individual bridges, bundles and components to be used with 4.0

Author: nicolas-grekas

composer.json

@@ -18,7 +18,7 @@
     "require": {
         "php": ">=5.5.9",
         "symfony/polyfill-php56": "~1.0",
-        "symfony/options-resolver": "~2.8|~3.0",
+        "symfony/options-resolver": "~2.8|~3.0|~4.0.0",
         "ext-ldap": "*"
     },
     "autoload": {