@MMathisLab, can you please, merge this branch?

• The matrix code is functional
• the Dockerfile was adjusted by Jessy (it's minor changes dor cuda & cudnn, but in any cases ARG parameters come from matrix bash script, so it's mostly for coherency).

Once it merged, I will PR to:

• : adjust docker developer-guide README
• the change versions in Dockerfile & matrix that will correspond to images on dockerhub.
  (I can't PR beautifully now, as it's fork from external branch, and I would prefer to avoid new forks/PR on stes repo, to keep the history more linear)