Some maintainers for different linux distribution are having some
problems with the encoding on different python versions. This change
intents to make all python files define explicitly the encoding, license
and unix line separators. Remove one example of the README.rst file
where a possible non UTF-8 character is used.
Also update the readme and fix error, on the README.rst file we say tha
code language to use is vn, but to make it work you have to use vi_VN.
Let's refactor this to use the proper iso code `vi` in all places.
