add gems needed.

compass-rails - a Stylesheet Authoring Environment
angularjs-rails - This is a rails app using angularJS as it's frontend framework
haml-rails - html template
activeadmin - create elegant backends for website administration

For development group:
better_errors - replace Rails default error page with a much better and more useful error page
guard,guard-livereload - two gems used to automatically reload stylesheet and js files