fixed Composer constraints

Author: fabpot

composer.json

@@ -18,14 +18,14 @@
     "require": {
         "php": ">=5.3.9",
         "symfony/asset": "~2.7",
-        "symfony/dependency-injection": "~2.6,>=2.6.2",
+        "symfony/dependency-injection": "^2.6.2",
         "symfony/config": "~2.4",
         "symfony/event-dispatcher": "~2.5",
-        "symfony/finder": "~2.0,>=2.0.5",
+        "symfony/finder": "^2.0.5",
         "symfony/http-foundation": "~2.7",
-        "symfony/http-kernel": "~2.7.23|~2.8.16",
+        "symfony/http-kernel": "~2.7.23|^2.8.16",
         "symfony/filesystem": "~2.3",
-        "symfony/routing": "~2.7.24|~2.8.17",
+        "symfony/routing": "~2.7.24|^2.8.17",
         "symfony/security-core": "~2.6.13|~2.7.9|~2.8",
         "symfony/security-csrf": "~2.6",
         "symfony/stopwatch": "~2.3",
@@ -36,16 +36,16 @@
     "require-dev": {
         "symfony/browser-kit": "~2.4",
         "symfony/console": "~2.7",
-        "symfony/css-selector": "~2.0,>=2.0.5",
-        "symfony/dom-crawler": "~2.0,>=2.0.5",
+        "symfony/css-selector": "^2.0.5",
+        "symfony/dom-crawler": "^2.0.5",
         "symfony/intl": "~2.3",
         "symfony/security": "~2.6",
-        "symfony/form": "~2.7.23|~2.8.16",
+        "symfony/form": "~2.7.23|^2.8.16",
         "symfony/class-loader": "~2.1",
         "symfony/expression-language": "~2.6",
-        "symfony/process": "~2.0,>=2.0.5",
+        "symfony/process": "^2.0.5",
         "symfony/validator": "~2.5",
-        "symfony/yaml": "~2.0,>=2.0.5",
+        "symfony/yaml": "^2.0.5",
         "sensio/framework-extra-bundle": "^3.0.2"
     },
     "suggest": {