$bear->user_tag->create(string $name);
$bear->user_tag->update(int $tagID, string $name);
$bear->user_tag->update(int $tagID);
$bear->user_tag->usersOfTag(int $tagID);
$bear->user_tag->tagUsers(array $openids, int $tagID);
$bear->user_tag->untagUsers(array $openids, int $tagID);
$bear->user_tag->userTags(int $openid);