BERJON Matthieu authored Nov 07, 2018 and BAIRE Anthony committed Dec 06, 2018

I added two models for ToS system. A first model called `Tos` that
stores the data itself of the policy using a version number and a link
to a PDF version if necessary. The content of the policy should be
written in markdown.
Another model just stores the user and its related ToS version in order
for the user to be able to sign several versions.

I updated the admin to display the information related to the ToS
models.

Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>