Add it to your Gemfile:

# Gemfile
gem 'route_translator'
gem 'itsf_backend'
gem 'ecm_cms2_backend'

Generate the initializers:

rails g itsf:backend:install
rails g ecm:cms:backend:install

Register the backend in the ITSF Backend configuration:

# config/initializers/itsf_backend.rb
Itsf::Backend.configure do |config|
  config.backend_engines = [
    Ecm::Cms::Backend::Engine
  ]
end

Mount the routes:

# config/routes.rb
localized do
  mount Itsf::Backend::Engine => '/backend'
  mount Ecm::Cms::Backend::Engine => '/backend/ecm/cms/'
end

gem install bundler
bundle 
cd spec/dummy && rake db:migrate RAILS_ENV=test && cd ../..
guard

This project rocks and uses MIT-LICENSE.