anchor.diff:  <h2>Edit <%= resource_name.to_s.humanize %></h2>
  -
  +<div class='form col-xs-3'>
   <%= form_for(resource, as: resource_name, url: registration_path(resource_name), html: { method: :put }) do |f| %>
     <%= devise_error_messages! %>
   
     <div class="field">
       <%= f.label :email %><br />
  -    <%= f.email_field :email, autofocus: true %>
  +    <%= f.email_field :email, autofocus: true, class: 'form-control' %>
     </div>
   
     <% if devise_mapping.confirmable? && resource.pending_reconfirmation? %>
  
positive.code: 
    <div class="field">
      <%= f.label :password_confirmation %><br />
      <%= f.password_field :password_confirmation, autocomplete: "off" %>
    </div>
  
    <div class="field">
      <%= f.label :current_password %> <i>(we need your current password to confirm your changes)</i><br />
      <%= f.password_field :current_password, autocomplete: "off" %>
    </div>
  
    <div class="actions">
      <%= f.submit "Update" %>
    </div>
  <% end %>
  
  <h3>Cancel my account</h3>
  
  <p>Unhappy? <%= button_to "Cancel my account", registration_path(resource_name), data: { confirm: "Are you sure?" }, method: :delete %></p>
  
  <%= link_to "Back", :back %>
  
negative.code: 
    <div class="field">
      <%= f.label :password %> <i>(leave blank if you don't want to change it)</i><br />
      <%= f.password_field :password, autocomplete: "off", class: 'form-control' %>
      <% if @minimum_password_length %>
        <br />
        <em><%= @minimum_password_length %> characters minimum</em>
  