bug fix: embed dailymotion mal formé.

src/Muzich/CoreBundle/ElementFactory/Site/DailymotioncomFactory.php

       $width = $this->container->getParameter('dailymotion_player_width');
       $height = $this->container->getParameter('dailymotion_player_height');
       return '<iframe frameborder="0" width="'.$width.'" height="'.$height.'" '
-        .'src="http://www.dailymotion.com/embed/video/xnqcwx"></iframe>';
+        .'src="'.$embed_url.'"></iframe>';
     }
     
     return null;