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static public function getSlug($cadena, $separador = '-')
{
  // Código copiado de http://cubiq.org/the-perfect-php-clean-url-generator
  $slug = iconv('UTF-8', 'ASCII//TRANSLIT', $cadena);
  $slug = preg_replace("/[^a-zA-Z0-9\/_|+ -]/", '', $slug);
  $slug = strtolower(trim($slug, $separador));
  $slug = preg_replace("/[\/_|+ -]+/", $separador, $slug);
  return $slug;
}