On Ingest, convert incoming `created_date` to internal `created_at` format
Per #302 (closed), all door exports now have a created_date field in the format YYYYMMDD.
On Ingest, this date can be converted to the created_at format for the following:
- Institutions
- Resources
- Notify Groups
- Passwords
Note: some lines in the export will not have created_date values.
Edited by Brad Baxter