Implements hook_uninstall().
function aggregator_uninstall() {
variable_del('aggregator_allowed_html_tags');
variable_del('aggregator_summary_items');
variable_del('aggregator_clear');
variable_del('aggregator_category_selector');
variable_del('aggregator_fetcher');
variable_del('aggregator_parser');
variable_del('aggregator_processors');
variable_del('aggregator_teaser_length');
}