=================
* No changes to program usage itself.
* More documentation.
* Major API changes due to refactoring:
* ``http.Body`` moved to ``conversation.Body``
* ``document.HTTPScraper``, ``document.CSSScraper`` moved to ``scraper`` module.
* ``conversation`` module now contains base classes for protocol elements.
* ``processor.WebProcessorSession`` now uses keyword arguments
* ``engine.Engine`` requires ``Statistics`` argument.