Wextracto

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* Add warc_protocol, warc_version, warc_headers to wex response

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* Fix errors in PhantomJS responses
* Handle non utf-8 urls

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* Ensure utf-8 is tried first even if not declared

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* Support onInitialized in PhantomJS required modules

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* Add --label argument for easy process-wide labelling

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* Fix shutdown error caused by daemon thread for timeout with phantomjs
* Fix handling of directories in tarfiles read from stdin (-)