Add more loggings for more detail information

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• Logs more detail information of the error.
• Save the content of response as html file.
• New function log_response which save the content of response.
• DEBUG option is added.
• Show all html file under /static/errors/ if build fails.

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https://github.com/PyCQA/pycodestyle/issues/755 It seems this is the reason why the build fails

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I think I need some more investigation about what is changed.

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I think my solution is right since the warning is about invalid backspace without raw string literal

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@manu-chroma , is there any problem?

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@jayvdb , can you review this PR?