Merge pull request #61 from atlasapi/mbst-5496-ingest-lf-sub-genres

Output sub-genres ingested from LoveFilm to YouView
Remove 'public' from interface methods, in line with java style guide.
Add ServiceIdRef to series if it is a top-level series.
Merge branch 'mbst-5629-add-serviceidref-to-top-level-series' into stage