Move rspec-rails into the test group - we shouldn't need it in development.
Move rspec-rails into the test group - we shouldn't need it in development.

Also add some comments about unused gems.

circleci/frontend,prathamesh-sonpatki/frontend,RayRutjes/frontend,circleci/frontend,circleci/frontend,RayRutjes/frontend,prathamesh-sonpatki/frontend