Adding helper for REST artifact_links

Change-Id: I0ac0d8ae0d1b4af2027b91e92ac53c92d73426d4
Separate composer from sources

With docker, it's root (or another user) who d/l and write
the various files. It will be in conflict with the owner of
sources from the host (developer or jenkins)

Change-Id: Ib3502d726dee359a9251ae6f670ad71d5ac54a23
Merge commit 'refs/changes/40/2840/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Adding helper for REST artifact_links

Change-Id: Ida785c4d1e990b5a0d69fe530ea2530d53d1b8dc
Merge commit 'refs/changes/42/2842/2' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Separate composer from sources

Change-Id: Ia06bc949b7be8ac2ae0d3fdb6e49776973c69a6e