REFACTOR: Fixes poor class hierarchy for listing topics

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

test/javascripts/integration/discover_topics_test.js

@@ -1,4 +1,4 @@
-integration("List Topics");
+integration("Discover Topics");
 
 test("Default List", function() {
   expect(2);