WP-2569: Add Publication CT migration class. Add Publication authors migration.
WP-2569: Fix GSBPublicationAuthors migration. Add latest csv source.
WP-2569: Never generate authors.csv on test/prod environment.
WP-2771 Adjusted code that saves the year published date to save just 'Y'
WP-2771 Adjusted code that saves the year published date to save just 'Y'
WP-2569: Update year field date format. Update source CSV files.
WP-2815: Add mapping for Publication URL.