#196 utils.web: Add get_encoding() function

[Valentin Lorentz]

Hi,

I added a function that tries to guess the encoding of a web page, which is useful for plugin developers who have to deal with encodings (particularily if they want their plugin to be compatible with Python 3).

https://github.com/ProgVal/Limnoria/commit/d4df5de91d6274e4193094a96619f1c026b40d53
https://github.com/ProgVal/Limnoria/commit/b4402b28ede8eb324b0adac4840aa813d86be882
https://github.com/ProgVal/Limnoria/commit/771b739af7c49623b413a2f95028c01acfc70807

Regards,
Valentin