Added re-mapping migration.
Added re-mapping migration.

mitodl/lore,mitodl/lore,mitodl/lore,amir-qayyum-khan/lore,mitodl/lore,amir-qayyum-khan/lore,mitodl/lore,amir-qayyum-khan/lore,amir-qayyum-khan/lore,amir-qayyum-khan/lore