title: Does devise work with multiple email_id with same account ??
body: <p><a href="https://github.com/plataformatec/devise" rel="nofollow">Devise</a> is a fantastic gem available for basic or omniauth authentication sign_up and other things like sessions maintenance, resend confirmation password etc . </p>
  
  <p>But is it possible using devise to map multiple email addresses to same user ? </p>
  
  <p>Like I have 3,4 email ids such as </p>
  
  <ol>
  <li>sahil@abc.com</li>
  <li>sahil@xyz.com</li>
  <li>sahil@mno.com</li>
  </ol>
  
  <p><strong>Use Case and Example</strong></p>
  
  <p>I have already registered with my first email id  i.e. <code>sahil@abc.com</code> using an automated system and account is created. But i always prefer to use my other email_id i.e. <code>sahil@xyz.com</code>. So, i want to build a system where user can login using any one of the above email adresses with the same/different password. But there should be one single account for the user.</p>