Posibility to alter token data for custom dimensions and metrics

This patch adds the hook_googleanalytics_custom_type_token_data_types_alter(). See below for an example how to implement this hook. To be able to use other tokens the settings form needs to be altered too, as below.

/**
 * Implements hook_googleanalytics_custom_type_token_data_types_alter().
 */
function custom_module_googleanalytics_custom_type_token_data_types_alter(&$types, $googleanalytics_custom_type) {

  // Check if menu object is taxonomy term.
  if (empty($types)) {
    $term = menu_get_object('taxonomy_term', 2);
    if (is_object($term)) {
      $types += array('term' => $term);
    }
  }

  // Check if menu object is fieldcollection item.
  if (empty($types)) {
    $field_collection_item = menu_get_object('field_collection_item', 2);
    if (is_object($field_collection_item)) {
      $types += array('field_collection_item' => $field_collection_item);
    }
  }
}

/**
 * Implements hook_googleanalytics_admin_settings_form_alter().
 */
function custom_module_form_googleanalytics_admin_settings_form_alter(&$form, &$form_state) {
  // Alter settings form to enable all token types for custom dimensions.
  for ($i = 1; $i <= 20; $i++) {
    $form['googleanalytics_custom_dimension']['indexes'][$i]['value']['#token_types'] = array('all');
  }
  if (module_exists('token')) {
    $form['googleanalytics_custom_dimension']['googleanalytics_token_tree']['#token_types'] = 'all';
  }
}