Email should be case insensitive, closes #372

CHANGELOG.rdoc

@@ -11,6 +11,7 @@
   * Devise should respect script_name and path_info contracts
   * Fix a bug when accessing a path with (.:format) (by github.com/klacointe)
   * Do not add unlock routes unless unlock strategy is email or both
+  * Email should be case insensitive
 
 * deprecations
   * use_default_scope is deprecated and has no effect. Use :as or :devise_scope in the router instead

lib/devise/models/validatable.rb

@@ -16,7 +16,7 @@ module Devise
 
         base.class_eval do
           validates_presence_of   :email
-          validates_uniqueness_of :email, :scope => authentication_keys[1..-1], :allow_blank => true
+          validates_uniqueness_of :email, :scope => authentication_keys[1..-1], :case_sensitive => false, :allow_blank => true
           validates_format_of     :email, :with  => email_regexp, :allow_blank => true
 
           with_options :if => :password_required? do |v|