Multiple Emails for Searching

This is a feature request. I apologize if it is a duplicate. I didn't see it already out there when I searched.

It would be great to be able to register multiple email addresses with my Keybase.io account. I personally have several that folks might search under, and couldn't find folks that I knew where on here because they had registered under a different name.

It would be cool, as well, that the system would try to validate the addresses associated with the key/cert that I just upload. Perhaps it isn't an automated email, but at least present a page giving me the ability to verify (or remove) those additional email addresses.

Then I could flag which one should be used for Keybase.io notifications.

No files or tests are named. Start by reviewing the existing account email, key/certificate upload, and notification flows described in the issue. Done would include supporting multiple addresses, providing verification or removal, and selecting the notification address.

Written by the indexing model from the issue text.