Cleanup bean classes.

better_bean_classes.php

<?php
/**
 * Implements hook_preprocess_block().
 */
function mymodule_preprocess_entity(&$variables) {

  // modify the classes on bean entities.
  if ($variables['entity_type'] == 'bean') {
    $variables['classes_array'] = array(
      drupal_html_class($variables['bean']->type),
      drupal_html_class($variables['bean']->type . '--' . $variables['bean']->delta),
    );

    if ($variables['view_mode'] != 'default') {
      $variables['classes_array'][] = drupal_html_class($variables['bean']->type . '--' . $variables['view_mode']);
    }
  }
}