Fix security/* cross-dependencies

Author: nicolas-grekas

composer.json

@@ -30,7 +30,7 @@
         "symfony/filesystem": "~2.3|~3.0.0",
         "symfony/routing": "^2.8.17",
         "symfony/security-core": "~2.6.13|~2.7.9|~2.8|~3.0.0",
-        "symfony/security-csrf": "~2.6|~3.0.0",
+        "symfony/security-csrf": "^2.8.31|^3.3.13",
         "symfony/stopwatch": "~2.3|~3.0.0",
         "symfony/templating": "~2.7|~3.0.0",
         "symfony/translation": "~2.8",
@@ -43,7 +43,6 @@
         "symfony/css-selector": "^2.0.5|~3.0.0",
         "symfony/dom-crawler": "^2.0.5|~3.0.0",
         "symfony/polyfill-intl-icu": "~1.0",
-        "symfony/security": "~2.6|~3.0.0",
         "symfony/form": "^2.8.19",
         "symfony/expression-language": "~2.6|~3.0.0",
         "symfony/process": "^2.0.5|~3.0.0",