A4 - allow admin to disapprove videos

@bpomerenke I think you somehow reintroduced the "string" comments in the schema.rb.  This should be text for postgres.  Only very short text fields should be string.  I'll switch it back.  If you see this show up in a diff again let me know, it means your schema is jacked bc we edited a  migration after it was on your box.  I'll show you how to resolve it.