Upgrade dependencies.

composer.json

@@ -16,20 +16,19 @@
             "homepage": "http://borisguery.com"
         }
     ],
-    "minimum-stability": "dev",
     "require": {
-        "symfony/framework-bundle": ">=2.0",
-        "doctrine/cache": ">=1.0",
+        "symfony/framework-bundle": "~2.0|~3.0",
+        "doctrine/cache": "~1.0",
         "jms/metadata": "1.*",
-        "jms/aop-bundle": ">=1.0.0,<1.2-dev",
-        "symfony/expression-language": "~2.4"
+        "jms/aop-bundle": "~1.0",
+        "symfony/expression-language": "~2.4|~3.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "3.*",
+        "phpunit/phpunit": "~4.0",
         "symfony/class-loader": "~2.3",
-        "symfony/yaml": "~2.3",
-        "symfony/finder": "~2.3",
-        "symfony/browser-kit": "~2.3"
+        "symfony/yaml": "~2.3|~3.0",
+        "symfony/finder": "~2.3|~3.0",
+        "symfony/browser-kit": "~2.3|~3.0"
     },
     "suggest": {
         "doctrine/cache": "Allows to use Doctrine Cache library"