diff --git a/app/check.php b/app/check.php
index daa6d0ae5b..91b826befe 100644
--- a/app/check.php
+++ b/app/check.php
@@ -25,8 +25,13 @@
 
 echo_title('Mandatory requirements');
 
+$checkPassed = true;
 foreach ($symfonyRequirements->getRequirements() as $req) {
+    /** @var $req Requirement */
     echo_requirement($req);
+    if (!$req->isFulfilled()) {
+        $checkPassed = false;
+    }
 }
 
 echo_title('Optional recommendations');
@@ -35,6 +40,8 @@
     echo_requirement($req);
 }
 
+exit($checkPassed ? 0 : 1);
+
 /**
  * Prints a Requirement instance
  */
diff --git a/app/config/config_dev.yml b/app/config/config_dev.yml
index 4bb7c8ba8f..c5619149ca 100644
--- a/app/config/config_dev.yml
+++ b/app/config/config_dev.yml
@@ -14,15 +14,18 @@ web_profiler:
 monolog:
     handlers:
         main:
-            type:  stream
-            path:  %kernel.logs_dir%/%kernel.environment%.log
-            level: debug
+            type:   stream
+            path:   %kernel.logs_dir%/%kernel.environment%.log
+            level:  debug
+        console:
+            type:   console
+            bubble: false
         firephp:
-            type:  firephp
-            level: info
+            type:   firephp
+            level:  info
         chromephp:
-            type:  chromephp
-            level: info
+            type:   chromephp
+            level:  info
 
 assetic:
     use_controller: true
diff --git a/app/config/config_prod.yml b/app/config/config_prod.yml
index e125e75258..ceba8197cb 100644
--- a/app/config/config_prod.yml
+++ b/app/config/config_prod.yml
@@ -21,3 +21,5 @@ monolog:
             type:  stream
             path:  %kernel.logs_dir%/%kernel.environment%.log
             level: debug
+        console:
+            type:  console
diff --git a/composer.json b/composer.json
index 4146999f17..c61f13ca4c 100644
--- a/composer.json
+++ b/composer.json
@@ -8,16 +8,16 @@
     },
     "require": {
         "php": ">=5.3.3",
-        "symfony/symfony": "2.3.*",
-        "doctrine/orm": ">=2.2.3,<2.4-dev",
-        "doctrine/doctrine-bundle": "1.2.*",
-        "twig/extensions": "1.0.*",
-        "symfony/assetic-bundle": "2.3.*",
-        "symfony/swiftmailer-bundle": "2.3.*",
-        "symfony/monolog-bundle": "2.3.*",
-        "sensio/distribution-bundle": "2.3.*",
-        "sensio/framework-extra-bundle": "2.3.*",
-        "sensio/generator-bundle": "2.3.*",
+        "symfony/symfony": "~2.4",
+        "doctrine/orm": "~2.2,>=2.2.3",
+        "doctrine/doctrine-bundle": "~1.2",
+        "twig/extensions": "~1.0",
+        "symfony/assetic-bundle": "~2.3",
+        "symfony/swiftmailer-bundle": "~2.3",
+        "symfony/monolog-bundle": "~2.4",
+        "sensio/distribution-bundle": "~2.3",
+        "sensio/framework-extra-bundle": "~2.3",
+        "sensio/generator-bundle": "~2.3",
         "incenteev/composer-parameter-handler": "~2.0"
     },
     "scripts": {
@@ -39,7 +39,7 @@
     "config": {
         "bin-dir": "bin"
     },
-    "minimum-stability": "RC",
+    "minimum-stability": "dev",
     "extra": {
         "symfony-app-dir": "app",
         "symfony-web-dir": "web",
diff --git a/src/Acme/DemoBundle/Command/HelloWorldCommand.php b/src/Acme/DemoBundle/Command/HelloWorldCommand.php
new file mode 100644
index 0000000000..998cbcdf24
--- /dev/null
+++ b/src/Acme/DemoBundle/Command/HelloWorldCommand.php
@@ -0,0 +1,48 @@
+<?php
+
+namespace Acme\DemoBundle\Command;
+
+use Symfony\Component\Console\Command\Command;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+
+/**
+ * Hello World command for demo purposes.
+ *
+ * You could also extend from Symfony\Bundle\FrameworkBundle\Command\ContainerAwareCommand
+ * to get access to the container via $this->getContainer().
+ *
+ * @author Tobias Schultze <http://tobion.de>
+ */
+class HelloWorldCommand extends Command
+{
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('acme:hello')
+            ->setDescription('Hello World example command')
+            ->addArgument('who', InputArgument::OPTIONAL, 'Who to greet.', 'World')
+            ->setHelp(<<<EOF
+The <info>%command.name%</info> command greets somebody or everybody:
+
+<info>php %command.full_name%</info>
+
+The optional argument specifies who to greet:
+
+<info>php %command.full_name%</info> Fabien
+EOF
+            );
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $output->writeln(sprintf('Hello <comment>%s</comment>!', $input->getArgument('who')));
+    }
+}