OEC-358, add secondary section cross-listings query. We seek completeness in rake oec:courses output
OEC-358: test data must resemble query results. Now, cross-listed-name is properly parsed and we need 'expect' statements
OEC-358 : improved doc on get_secondary_cross_listings query
Merge pull request #2979 from johncrossman/OEC-358

OEC-358, add secondary section cross-listings query