Added test cases for querying the 'journal' index.
Added test cases for querying the 'journal' index.

tiborsimko/invenio-records,inveniosoftware/invenio-search,inveniosoftware/invenio-records,inveniosoftware/invenio-search,inveniosoftware/invenio-records,tiborsimko/invenio-search,tiborsimko/invenio-search,tiborsimko/invenio-records