[Workflow] Set the marking then announce enabled transition

It allows to auto-apply some transition from a listener.

The feature was asked here: https://twitter.com/gaetanbuellet/status/796387741420441600
And It has been implemented in userland here:
https://github.com/lyrixx/SFLive-Paris2016-Workflow/tree/auto-apply

Author: lyrixx

src/Symfony/Component/Workflow/Workflow.php

@@ -126,10 +126,10 @@ public function apply($subject, $transitionName)
 
         $this->enter($subject, $transition, $marking);
 
-        $this->announce($subject, $transition, $marking);
-
         $this->markingStore->setMarking($subject, $marking);
 
+        $this->announce($subject, $transition, $marking);
+
         return $marking;
     }