REFACTOR: Fixes poor class hierarchy for listing topics

- Upgrades Ember to latest
- Fixes a bunch of bugs with page titles and missing "active" states

spec/jobs/periodical_updates_spec.rb

@@ -29,8 +29,4 @@ describe Jobs::PeriodicalUpdates do
     calculator.expects(:calculate)
   end
 
-  it "refreshes hot topics" do
-    HotTopic.expects(:refresh!).once
-  end
-
 end