Add todoapp benchmark

bench/implementations/ember-2.6.3/app/helpers/gt.js

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+import Ember from 'ember';
+
+export function gt([n1, n2]/*, hash*/) {
+	return n1 > n2;
+}
+
+export default Ember.Helper.helper(gt);

bench/implementations/ember-2.6.3/app/helpers/pluralize.js

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+import Ember from 'ember';
+import { pluralize } from 'ember-inflector';
+
+export function pluralizeHelper([singular, count]/*, hash*/) {
+	return count === 1 ? singular : pluralize(singular);
+}
+
+export default Ember.Helper.helper(pluralizeHelper);