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)
i can try. will have to figure out what's going on first ;-)

original ticket was to upgrade to newer rspec syntax and remove fixtures, so I tried to limit my changes to only accomplishing that goal, but I can certainly try to clean things up here and there too