Allow to set custom event_id [LEGACY] (#930)

* +allow to set a custom event_id as an extra parameter instead of letting Raven generate a UUIDv4

* +CS

* +CS

* +verbose array syntax because of PHP 5.3 support

src/Monolog/Handler/RavenHandler.php

@@ -216,7 +216,7 @@ class RavenHandler extends AbstractProcessingHandler
      */
     protected function getExtraParameters()
     {
-        return array('checksum', 'release');
+        return array('checksum', 'release', 'event_id');
     }
 
     /**