uploader: update demosite field definitions

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@gmail.com>
records: new scopus reader

* First attemp to upload scopus json records.

Signed-off-by: Esteban J. G. Gabancho <esteban.gabancho@gmail.com>
Merge branch 'pu-uploader-scopus' of https://github.com/egabancho/invenio-demosite into pu
add doi and affiliation to scopus_json parser