fixed failing tests (missing implementation of 'save' in repository)
fixed failing tests (missing implementation of 'save' in repository)

uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/osis,uclouvain/osis,uclouvain/OSIS-Louvain,uclouvain/osis,uclouvain/OSIS-Louvain