Email case insensitivity on login

[DNGros]

The user login email is case sensitive resulting incorrect account-not-found errors or forcing the user to try variations of their email until they find the how they entered it inicially
It could likely be fixed with a change to

pepper/pepper/users/views.py

Line 45 in 759d7a4

user = User.query.filter_by(email=email).first()

to do a case insensitive query.
(this seems fairly easy to do https://stackoverflow.com/questions/16573095/case-insensitive-flask-sqlalchemy-query).

It should also probably be investigated whether the corporate login has this same issue. The password reset link doesn't seem to have this issue, but I am not sure why.

[rohitdatta]

Agreed. We're going to change this to instead .lower() on account creation, which won't deploy for myHackTX 2017, but will prevent duplicate accounts in the system