config/application.rb

application.rb

...

config.generators do |g|
  g.template_engine :haml
  g.form_builder :formtastic
  g.test_framework :rspec, :fixture => true, :views => true
  g.fixture_replacement :factory_girl, :dir => 'factories'
  g.stylesheets false
end

...

Gemfile

...

group :development do
  ...
  gem 'rails3-generators'
  gem 'haml-rails'
  ...
end

...