Usernames are case sensitive. #86
Description
I'm not sure if this is the intended function or not, but usernames are case sensitive.
This seems like an easy fix on the client side by just adding .ToLower(), but this would prevent existing users with capitalized usernames from logging in. I'm not familiar with MongoDB so I don't know how to iterate through all the users to set the names lowercase.
This could also cause issues if there were multiple users with the same username with different capitalizations.