hashed email instead of plaintext

[ramsey-grove]

It would be very useful if there was a setting such that the email value is hashed instead of plaintext wherever it is used. This would alleviate having to deal with personally identifiable information in things like request logs and database tables. Ideally, the email would be hashed along with a configurable secret (just a random 32 char or more string) to prevent easily reversing the hash with rainbow tables.