PCC: remove rails pieces we won't use

[ndushay]

(we can always add them back later if we need them; rails new created a lot of stuff we won't use)

• app/assets folder

• app/channels folder

• app/views folder

• config/cable.yml
  - [ ] config/spring.rb we 'need' this for development environment

• config/initializers/assets.rb (? - might also require tweaks to application.rb to not use the rails piece, and then to config/environments/xxx.rb to not use the settings ...)

• lib/assets folder

• lib/tasks folder

• spec/helpers folder

• spec/views folder

less certain

• app/helpers
• app/jobs
• app/mailers

[ndushay]

Should we consider pairing down our require "rails/all" to just the pieces we need, too? (config/application.rb) It could make our tests run faster if it is loading less code ... See http://guides.rubyonrails.org/initialization.html#loading-rails

[tallenaz]

I'm open to that. From a first pass, the app will start up with, at minimum:

require 'active_record/railtie'
require 'action_controller/railtie'
require 'action_mailer/railtie'

It's unhappy without action_mailer/railtie, even though we probably won't use mailers. Anyway, it's a smaller list than what rails/all encompasses.