74977456 'Articles model/controller/view specs refactoring'

https://www.pivotaltracker.com/story/show/74977456
(part of epic 74977456 https://www.pivotaltracker.com/epic/show/1288994)
hi Yaro, I tried this but the problem is receive_message_chain is only available in RSPEC 3, and we are still on 2.99