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* Fixes invalid XHTML documents not properly extracted for links.
* Fixes crash on empty page.
* Support for extracting links from JavaScript segments and files.
* Doesn't discard extracted links if document can only be parsed partially.
* API:
* Moves ``OrderedDefaultDict`` from ``util`` to ``collections``.
* Moves ``DeflateDecompressor``, ``gzip_decompress`` from ``util`` to ``decompression``.
* Moves ``sleep``, ``TimedOut``, ``wait_future``, ``AdjustableSemaphore`` from ``util`` to ``async``.
* Moves ``to_bytes``, ``to_str``, ``normalize_codec_name``, ``detect_encoding``, ``try_decoding``, ``format_size``, ``printable_bytes``, ``coerce_str_to_ascii`` from ``util`` to ``string``.
* Removes ``extended`` module.
* Scripting:
* Adds new `wait_time()` callback hook function.