Added link and fixed code example.
Added link and fixed code example.

andrewdavey/cassette,BluewireTechnologies/cassette,BluewireTechnologies/cassette,andrewdavey/cassette,damiensawyer/cassette,honestegg/cassette,damiensawyer/cassette,damiensawyer/cassette,andrewdavey/cassette,honestegg/cassette,honestegg/cassette