W3lib

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- meta_refresh regex now handles leading newlines and whitespaces in the url;
- include tests folder in source distribution.

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- url_query_cleaner now supports str or list parameters;
- add support for resolving base URLs in <base> tags with attributes
before href.

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- reverted all 1.9.0 changes.

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- all url-related functions accept bytes and unicode and now return bytes.

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- w3lib.http.basic_auth_header now returns bytes

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- add support for big5-hkscs encoding.