Missing parameters in delete_all and delete

[Vgrande88]

After read the comments: delete document from the passed collection based upon certain criteria, and the examples of usage: $this->mongo_db->delete_all('foo', $data = array());

The functions doesn't get the second parameter (criterias), then delete_all and delete works equally?

Beside that, remove_index are doing a wrong check (empty ($ keys)) when not receive $keys but it is $name