Add todoapp benchmark

bench/implementations/ember-2.6.3/app/controllers/active.js

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+import Ember from 'ember';
+
+export default Ember.Controller.extend({
+	todos: Ember.computed.filterBy('model', 'completed', false)
+});

bench/implementations/ember-2.6.3/app/controllers/application.js

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+import Ember from 'ember';
+
+export default Ember.Controller.extend({
+	repo: Ember.inject.service(),
+	remaining: Ember.computed.filterBy('model', 'completed', false),
+	completed: Ember.computed.filterBy('model', 'completed'),
+	actions: {
+		createTodo(e) {
+			if (e.keyCode === 13 && !Ember.isBlank(e.target.value)) {
+				this.get('repo').add({ title: e.target.value.trim(), completed: false });
+				e.target.value = '';
+			}
+		},
+
+		clearCompleted() {
+			this.get('model').removeObjects(this.get('completed'));
+		}
+	}
+});

bench/implementations/ember-2.6.3/app/controllers/completed.js

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+import Ember from 'ember';
+
+export default Ember.Controller.extend({
+	todos: Ember.computed.filterBy('model', 'completed', true)
+});