Allow either username or email address to be used as a login
Allow either username or email address to be used as a login

This change was introduced in 7c72c7e08d2a1a63e but looks like it was
accidentally reverted in 799963349f1ac02d.

DemocracyClub/yournextrepresentative,DemocracyClub/yournextrepresentative,DemocracyClub/yournextrepresentative