Deploy the Eclipse artifacts and features (issue #8).
The Maven plugin is configured to deploy the elements according to:
* the snapshot versions are copied into the folder ./snapshots/<version>/R<timestamp>, where <version> is the version number without the "-SNAPSHOT".
* the release versions are copied into the folder ./releases/<version>, where <version>.

By default, the output directory is the local folder /var/www/sarl-p2-repository.
Merge branch 'master' of https://github.com/sarl/sarl
Merge branch 'master' of https://github.com/sarl/sarl