Barry 1.0

TODO:

- [ ] Migrate unit tests for (at least) the `iter_*` methods that we renamed
- [ ] Add integration tests for all renamed `iter_*` methods.

Check the following only when both integration and unit tests are written for them:

- [ ] ``Release#assets``
- [ ] ``User#events``
- [ ] ``User#followers``
- [ ] ``User#following``
- [ ] ``User#keys``
- [ ] ``User#organization_events``
- [ ] ``User#received_events``
- [ ] ``User#organizations``
- [ ] ``User#starred_repositories``
- [ ] ``User#subscriptions``