Merge branch '2.7' into 2.8

* 2.7:
  Require symfony/intl ~2.4 when Locale::setDefault() is used
  [Form][2.7][ Choice type] fixed groups with empty array.

Conflicts:
	src/Symfony/Component/Form/composer.json
	src/Symfony/Component/Translation/composer.json
	src/Symfony/Component/Validator/composer.json

Author: nicolas-grekas

composer.json

@@ -21,7 +21,7 @@
     "require-dev": {
         "symfony/phpunit-bridge": "~2.7|~3.0.0",
         "symfony/config": "~2.7",
-        "symfony/intl": "~2.3|~3.0.0",
+        "symfony/intl": "~2.4|~3.0.0",
         "symfony/yaml": "~2.2|~3.0.0",
         "psr/log": "~1.0"
     },