Move contributors + proposals to service

With this change we have all the contributors + proposals all the time in one place and can update them via events.

app/routes/application.js

@@ -15,4 +15,8 @@ export default Route.extend({
       }
     });
   },
+
+  afterModel() {
+    return this.get('kredits').loadContributorsAndProposals();
+  }
 });