Restapi

Finalize Restapi reading feature
Please note that `run_sql` is deprecated and you should use the SQLAlchemy models `Bib98x` and `BibrecBib98x` indead. Invenio has also build-in support for pagination in REST APIs see https://github.com/inveniosoftware/invenio/blob/pu/invenio/ext/restful/pagination.py