Replace userID with email (#664)
Replace userID with email (#664)

We realized that using User IDs for access control is much less efficient than having an understanding of user emails, so we replaced them with IDs here.
google/grr,dunkhong/grr,dunkhong/grr,google/grr,google/grr,google/grr,dunkhong/grr,google/grr,google/grr,google/grr,dunkhong/grr,dunkhong/grr,dunkhong/grr,dunkhong/grr