The util.php file  is added

The GetSlug function has been implementated in src/Hechizo/OfertaBundle/Util/Util.php.
The entities Ciudad.php, Oferta.php and Tienda.php have been modified and now use the getSlug function when set the name attribute
src/Cupon/CiudadBundle/DataFixtures/ORM/Ciudades.php has changed because just now it isn't necessary to save Slug