Change-Id: I0bcb4fdbe4c0d4d512c0382187809c05defb6b18
Reviewed-by: Anthony Léonard <anthony.leonard@savoirfairelinux.com>

This new documentation can be built using `make docs`. It should be
built automatically via a hook on github and published on
https://ring.readthedocs.org.

This allows for much better formatting and is more pleasant to browse
for new contributors. It is possible to build the docs using the
Makefile at the root of the repository.

Change-Id: I664d4662b76c525f2a67eac6266bada3e94aa835
Tuleap: #595

Add ability to init all submodules with a proper commit-msg

Change-Id: I57efc4364d74587feccd3cf00e3ee5b9ee4f7465
Tuleap: #540

Change-Id: I52a988bc02021c2d90c586801fbe811e602196d7
Tuleap: #451