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 yggie, thanks for your feedback.

i'm a little new at this pull request thing. what is the process? do i make the changes and submit a new pull request, or is there a way to modify this one somehow?