added bootstrap 3rd party dependencies

lib/3rdparty/systemjs/babel-helpers/set.js

@@ -0,0 +1,21 @@
+export default (function set(object, property, value, receiver) {
+  var desc = Object.getOwnPropertyDescriptor(object, property);
+
+  if (desc === undefined) {
+    var parent = Object.getPrototypeOf(object);
+
+    if (parent !== null) {
+      set(parent, property, value, receiver);
+    }
+  } else if ("value" in desc && desc.writable) {
+    desc.value = value;
+  } else {
+    var setter = desc.set;
+
+    if (setter !== undefined) {
+      setter.call(receiver, value);
+    }
+  }
+
+  return value;
+});