WP-4079: Add idea story migration classes and data.
WP-4079: Add a fix for imgur image URLs. Add stubs to solve chicken-egg proglem with Related Story field.
WP-4160: Add Images, Youtube, Callout migration classes.
WP-4160: Add Idea Story twitter resources migration.
WP-4146: Add Related Faculty, Rethink, Business Journal mapping and create redirects.