Implements hook_block_save().
function statistics_block_save($delta = '', $edit = array()) {
config('statistics.settings')
->set('block.popular.top_day_limit', $edit['statistics_block_popular_top_day_limit'])
->set('block.popular.top_all_limit', $edit['statistics_block_popular_top_all_limit'])
->set('block.popular.top_recent_limit', $edit['statistics_block_popular_top_recent_limit'])
->save();
}