Replace setupController for injection+computed.alias

This makes the relationship between the controllers more obvious.

Author: locks

app/controllers/category/index.js

@@ -11,6 +11,9 @@ export default Ember.Controller.extend(PaginationMixin, {
 
     totalItems: computed.readOnly('model.meta.total'),
 
+    categoryController: Ember.inject.controller('category'),
+    category: computed.alias('categoryController.model'),
+
     currentSortBy: computed('sort', function() {
         return (this.get('sort') === 'downloads') ? 'Downloads' : 'Alphabetical';
     }),

app/routes/category/index.js

@@ -9,10 +9,5 @@ export default Ember.Route.extend({
     model(params) {
         params.category = this.paramsFor('category').category_id;
         return this.store.query('crate', params);
-    },
-
-    setupController(controller, model) {
-        controller.set('category', this.modelFor('category'));
-        this._super(controller, model);
-    },
+    }
 });