Fixed handling of 'limit' parameter. Added 'extension' parameter.
Fixed handling of 'limit' parameter.
Added 'extension' parameter.

tiborsimko/invenio-formatter,inveniosoftware/invenio-formatter,inveniosoftware/invenio-formatter,tiborsimko/invenio-formatter,tiborsimko/invenio-formatter,inveniosoftware/invenio-formatter