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
4 jobs for master in 7 minutes and 20 seconds (queued for 10 seconds)
Status Job ID Name Coverage
  Build
passed #22076
conda-linux
build_linux_27

00:04:26

 
  Test
failed #22077
conda-linux
test_linux_27

00:02:54

 
  Docs
skipped #22078
conda-linux
docs_linux_27
 
  Wheels
skipped #22079
conda-linux
wheels_linux_27
 
Name Stage Failure
failed
test_linux_27 Test There is an unknown failure, please try again
Exception: tostring() has been removed. Please call tobytes() instead.

----------------------------------------------------------------------
Ran 8 tests in 1.031s

FAILED (errors=6)
Running after script...
$ rm -rf ${CONDA_PREFIX}
ERROR: Build failed: exit status 1