Support for Unicode csv files

[xZise]

Now that unicodecsv has dropped support for Python 2.6 we from pywikibot-core are wondering if the future package might add support for Unicode in csv files.

[JelteF]

There is also the https://github.com/ryanhiebert/backports.csv library. This should probably work even better.
Is it possible to modify this library so pasteurize replaces all csv imports with backports.csv. If so, in what file should I do this?