Test lowest versions of dependencies

Author: nicolas-grekas

composer.json

@@ -17,20 +17,19 @@
     ],
     "require": {
         "php": ">=5.3.3",
-        "symfony/security": "~2.4",
+        "symfony/security": "~2.5",
         "symfony/http-kernel": "~2.2"
     },
     "require-dev": {
-        "symfony/browser-kit": "~2.3",
+        "symfony/browser-kit": "~2.4",
         "symfony/css-selector": "~2.0,>=2.0.5",
         "symfony/dependency-injection": "~2.3",
         "symfony/dom-crawler": "~2.0,>=2.0.5",
-        "symfony/form": "~2.3",
-        "symfony/framework-bundle": "~2.2,<2.6.0",
+        "symfony/form": "~2.4",
+        "symfony/framework-bundle": "~2.4,<2.6.0",
         "symfony/http-foundation": "~2.3",
         "symfony/twig-bundle": "~2.2",
         "symfony/twig-bridge": "~2.2,>=2.2.6",
-        "symfony/form": "~2.3",
         "symfony/process": "~2.0,>=2.0.5",
         "symfony/validator": "~2.2",
         "symfony/yaml": "~2.0,>=2.0.5",