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)
as noted above, receive_message_chain() was introduced in Rspec 3 and is not available for us to use in Rspec 2.99