Wpull

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* Supports reading HTTP responses with gzip content type.

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* 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.

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* Implements ``--progress`` which includes a progress bar indicator.
* Bumps up the HTTP connection buffer size to support fast connections.

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* Adds documentation. No program changes.

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* Improves robustness against bad HTTP protocol messages.
* Fixes various URL and IRI handling issues.
* Fixes ``--input-file`` to work as expected.
* Fixes command line arguments not working under Python 2.

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* Improves handling on URLs and document encodings.
* Implements ``--ascii-print``.
* Fixes Lua scripting conversion of Python to Lua object types.