add traceur test suite

test/fixtures/traceur/ArrayIterator.js

@@ -0,0 +1,27 @@
+var a = ['a', 'b', 'c'];
+
+var res = [];
+for (var x of a) {
+  res.push(x);
+}
+assert.deepEqual(res, ['a', 'b', 'c']);
+
+//assert.equal(a[Symbol.iterator], a.values);
+
+res = [];
+for (var x of a.values()) {
+  res.push(x);
+}
+assert.deepEqual(res, ['a', 'b', 'c']);
+
+res = [];
+for (var x of a.keys()) {
+  res.push(x);
+}
+assert.deepEqual(res, [0, 1, 2]);
+
+res = [];
+for (var x of a.entries()) {
+  res.push(x);
+}
+assert.deepEqual(res, [[0, 'a'], [1, 'b'], [2, 'c']]);