Fixes #3831 - Add documentation about rsync modules from rudder-project
Refs #3831 - precise to use a web server to share the files
Merge pull request #16 from nperron/bug_3831/dev/add_doc_about_rsync_module

Fixes #3831 - Add documentation about rsync modules from rudder-project
Merge branch 'branches/rudder/2.4' into branches/rudder/2.6
Merge branch 'branches/rudder/2.6' into branches/rudder/2.7