*  Remove data:abort_if_pending_migrations *  Add shell for data:down *  data:rollback + supporting functions
*  Remove data:abort_if_pending_migrations
*  Add shell for data:down
*  data:rollback + supporting functions

ilyakatz/data-migrate,ifeelgoods/data-migrator,innovation-force/data-migrate,p-han/data-migrate-end,infinum/data-migrate,kitcheck/data-migrate,ifeelgoods/data-migrator,blueapron/data-migrate,ajvargo/data-migrate,grnhse/data-migrate