Ability to associate more than one email address with a User account

[Max Peterson]

This is useful for people who want to forward their mail from more than one email address.

It would probably be located in an "Account Settings" or "Account Profile" link.

[Max Peterson]

Probably want to store a ListProperty on the WTUser model, something like "emails".

It would contain the actual email address and then any other email addresses that the user wants to associate with his or her self.

Then when receiving an email, we'd look for users who have the to: address in their "emails" list. Then assign the package.owner to that user.