Sort dependencies

This makes the diffs look more normal, groups packages by vendor and
reduces conflicts.

composer.json

@@ -45,10 +45,10 @@
     "require-dev": {
         "jms/di-extra-bundle": "^1.7",
         "sensio/generator-bundle": "^2.3 || ^3.0",
-        "symfony/yaml": "^2.3 || ^3.0",
+        "sllh/php-cs-fixer-styleci-bridge": "^2.0",
         "sonata-project/intl-bundle": "^2.2.4",
         "symfony/phpunit-bridge": "^2.7 || ^3.0",
-        "sllh/php-cs-fixer-styleci-bridge": "^2.0"
+        "symfony/yaml": "^2.3 || ^3.0"
     },
     "conflict": {
         "jms/di-extra-bundle": "<1.7.0"