require rails generator base class in devise generators

closes #2743

lib/generators/devise/devise_generator.rb

@@ -1,3 +1,5 @@
+require 'rails/generators/named_base'
+
 module Devise
   module Generators
     class DeviseGenerator < Rails::Generators::NamedBase

lib/generators/devise/install_generator.rb

@@ -1,3 +1,4 @@
+require 'rails/generators/base'
 require 'securerandom'
 
 module Devise

lib/generators/devise/views_generator.rb

@@ -1,3 +1,5 @@
+require 'rails/generators/base'
+
 module Devise
   module Generators
     # Include this module in your generator to generate Devise views.

lib/generators/mongoid/devise_generator.rb

@@ -1,3 +1,4 @@
+require 'rails/generators/named_base'
 require 'generators/devise/orm_helpers'
 
 module Mongoid