Always check email case on login
Always check email case on login

Fixes : https://github.com/mozilla/fxa-auth-server/issues/800

chilts/fxa-auth-server,mozilla/fxa-auth-server,dannycoates/picl-idp,mozilla/fxa-auth-server,dannycoates/picl-idp,shane-tomlinson/fxa-auth-server,eoger/fxa-auth-server,mozilla/fxa-auth-server,chilts/fxa-auth-server,mozilla/fxa-auth-server,chilts/fxa-auth-server,dannycoates/picl-idp,dannycoates/picl-idp,TDA/fxa-auth-server,shane-tomlinson/fxa-auth-server,shane-tomlinson/fxa-auth-server,eoger/fxa-auth-server,shane-tomlinson/fxa-auth-server,eoger/fxa-auth-server,TDA/fxa-auth-server,TDA/fxa-auth-server,chilts/fxa-auth-server,eoger/fxa-auth-server,TDA/fxa-auth-server