title: Rails - Devise, Email Case Insensitivity
body: <p>I'm using Devise with login credentials: email/password - no usernames</p>
  
  <p>I just noticed that the login process is case sensitive for emails. so if you register with bob@apPle.com, and then try to log in with Bob@apple.com you get an error. Very confusing.</p>
  
  <p>How can I make devise log people in with their email/password, and the email being case insensitive?</p>