Merge branch 'standarization' into 'master'

Standarization

I know that it still doesn't build on GitLab CI -- due to a wrong version of  ``Pillow`` (see #1). Anyways, I think it is time to merge this branch and go on pushing a new version of ``bob.bio.csu`` to PyPI.

I know that this is not sufficient, but I have installed that package locally on my machine, and I was able to build and execute it. Nose tests are passing; I haven't checked the documentation, though.

See merge request !1