Update composer requirements for 2.1

composer.json

@@ -4,16 +4,19 @@
     },
     "require": {
         "php": ">=5.3.2",
-        "symfony/symfony": "2.0.10",
-        "doctrine/dbal": "2.1.6",
-        "doctrine/orm": "2.1.6",
+        "symfony/symfony": "2.1.0-dev",
+        "doctrine/dbal": "master-dev",
+        "doctrine/orm": "master-dev",
+        "doctrine/doctrine-bundle": "master-dev",
         "twig/extensions": "master-dev",
-        "symfony/assetic-bundle": "2.0-dev",
-        "sensio/distribution-bundle": "2.0-dev",
-        "sensio/framework-extra-bundle": "2.0-dev",
-        "sensio/generator-bundle": "2.0-dev",
-        "jms/security-extra-bundle": "1.0.x-dev",
-        "jms/metadata": "1.1.1"
+        "symfony/assetic-bundle": "2.1.0-dev",
+        "symfony/swiftmailer-bundle": "2.1.0-dev",
+        "symfony/monolog-bundle": "2.1.0-dev",
+        "sensio/distribution-bundle": "master-dev",
+        "sensio/framework-extra-bundle": "master-dev",
+        "sensio/generator-bundle": "master-dev",
+        "jms/security-extra-bundle": "master-dev",
+        "jms/metadata": "master-dev"
     },
     "scripts": {
         "post-install-cmd": [