add support for super in object literals - fixes #411

test/fixtures/transformation/es6-object-super/simple.js

@@ -0,0 +1,15 @@
+var a = {
+  name() {
+    return "Suyash";
+  }
+};
+
+var b = {
+  name() {
+    return super.name() + " Verma";
+  }
+};
+
+Object.setPrototypeOf(b, a);
+
+assert.equal(b.name(), "Suyash Verma");