MiscUtil: authenticated InvenioConnector
MiscUtil: authenticated InvenioConnector

* Add support for authentication in InvenioConnector. (closes #586)

* New class CDSInvenioConnector that support authentication to the
  SSO-based CERN Document Server.

tiborsimko/invenio,inveniosoftware/invenio,inveniosoftware/invenio,tiborsimko/invenio