Revert "removed 3.0 constraints from 2.7 composer files"

This reverts commit 5503804cf91f4ede81b94b34609653c013139038.

Author: fabpot

composer.json

@@ -17,25 +17,25 @@
     ],
     "require": {
         "php": ">=5.3.9",
-        "symfony/security": "~2.7",
-        "symfony/http-kernel": "~2.2"
+        "symfony/security": "~2.7|~3.0.0",
+        "symfony/http-kernel": "~2.2|~3.0.0"
     },
     "require-dev": {
-        "symfony/phpunit-bridge": "~2.7",
-        "symfony/browser-kit": "~2.4",
-        "symfony/console": "~2.7",
-        "symfony/css-selector": "~2.0,>=2.0.5",
-        "symfony/dependency-injection": "~2.6,>=2.6.6",
-        "symfony/dom-crawler": "~2.0,>=2.0.5",
-        "symfony/form": "~2.7",
-        "symfony/framework-bundle": "~2.7",
-        "symfony/http-foundation": "~2.3",
-        "symfony/twig-bundle": "~2.7",
-        "symfony/twig-bridge": "~2.7",
-        "symfony/process": "~2.0,>=2.0.5",
-        "symfony/validator": "~2.5",
-        "symfony/yaml": "~2.0,>=2.0.5",
-        "symfony/expression-language": "~2.6",
+        "symfony/phpunit-bridge": "~2.7|~3.0.0",
+        "symfony/browser-kit": "~2.4|~3.0.0",
+        "symfony/console": "~2.7|~3.0.0",
+        "symfony/css-selector": "~2.0,>=2.0.5|~3.0.0",
+        "symfony/dependency-injection": "~2.6,>=2.6.6|~3.0.0",
+        "symfony/dom-crawler": "~2.0,>=2.0.5|~3.0.0",
+        "symfony/form": "~2.7|~3.0.0",
+        "symfony/framework-bundle": "~2.7|~3.0.0",
+        "symfony/http-foundation": "~2.3|~3.0.0",
+        "symfony/twig-bundle": "~2.7|~3.0.0",
+        "symfony/twig-bridge": "~2.7|~3.0.0",
+        "symfony/process": "~2.0,>=2.0.5|~3.0.0",
+        "symfony/validator": "~2.5|~3.0.0",
+        "symfony/yaml": "~2.0,>=2.0.5|~3.0.0",
+        "symfony/expression-language": "~2.6|~3.0.0",
         "doctrine/doctrine-bundle": "~1.2",
         "twig/twig": "~1.12",
         "ircmaxell/password-compat": "~1.0"