Added journal-issn mappings collected from http://cdsweb.cern.ch/. Removed 'limit' option which was not necessary (building mappings is fast).
Added journal-issn mappings collected from http://cdsweb.cern.ch/.
Removed 'limit' option which was not necessary (building mappings is fast).

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