* `Iterator.next()`` has been replaced with `Iterator.__next__()`
* The `object.__unicode__()` method is not used anymore
* Default source encoding has changed from ASCII to UTF-8

This fixes tests not being added to the source package.

- Moving code related to waiting/sleeping/retrying into a new class for a more object oriented approach.
- Removing any reference to wait "tokens" to avoid confusion with edit tokens.
- Note: `max_retries` and `retry_timeout` are no longer available on `Site`, but can still be passed into the constructor as before.