Update some more widget examples from ipython repo

Author: takluyver

examples/Interactive Widgets/Custom Widget - Hello World.ipynb

@@ -179,6 +179,8 @@
     "- Tuple\n",
     "- Type\n",
     "- Unicode\n",
+    "- Union\n",
+    "\n",
     "\n",
     "**Not all of these traitlets can be synchronized** across the network, **only the JSON-able** traits and **Widget instances** will be synchronized."
    ]
@@ -223,7 +225,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "You first need to **import the `widget` and `manager` modules**.  You will use it later to register your view by name (the same name you used in the back-end).  To import the modules, use the `require` method of [require.js](http://requirejs.org/) (as seen below)."
+    "You first need to **import the `widget` and `manager` modules**.  You will use the manager later to register your view by name (the same name you used in the back-end).  To import the modules, use the `require` method of [require.js](http://requirejs.org/) (as seen below).\n"
    ]
   },
   {
@@ -769,15 +771,23 @@
  ],
  "metadata": {
   "kernelspec": {
-   "codemirror_mode": {
-    "name": "python",
-    "version": 2
-   },
-   "display_name": "Python 2",
+   "display_name": "Python 3",
    "language": "python",
-   "name": "python2"
+   "name": "python3"
+  },
+  "language_info": {
+   "codemirror_mode": {
+    "name": "ipython",
+    "version": 3
+   },
+   "file_extension": ".py",
+   "mimetype": "text/x-python",
+   "name": "python",
+   "nbconvert_exporter": "python",
+   "pygments_lexer": "ipython3",
+   "version": "3.4.0"
   }
  },
  "nbformat": 4,
  "nbformat_minor": 0
-}
+}