complete reports. closes (#24) and (#29)

reports controller is disgusting,
but CC still gives us a 3.34 so I am not refactoring for now

app/controllers/reports_controller.rb
   def highest_ratings
   def lowest_ratings
app/views/reports/index.html.haml
+%h2 Highest Ratings
+%h2 Lowest Ratings
spec/features/reports_spec.rb
         it 'shows the user with the lowest ratings' do
         it 'shows the user with the highest ratings' do
         it 'still has not changed the most active user' do
           fix some capybara clicking