adding a logger for chill

The logger log messages to channel "chill".

The name of the service is `chill.main.logger`

DependencyInjection/ChillMainExtension.php

@@ -34,6 +34,7 @@ class ChillMainExtension extends Extension implements PrependExtensionInterface
 
         $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('services.yml');
+        $loader->load('services/logger.yml');
     }
 
     public function prepend(ContainerBuilder $container) 
@@ -82,5 +83,10 @@ class ChillMainExtension extends Extension implements PrependExtensionInterface
               
            )
         ));
+        
+        //add a channel to log app events
+        $container->prependExtensionConfig('monolog', array(
+            'channels' => array('chill')
+        ));
     }
 }