upate exmaple notebooks to nbformat v4

examples/Builtin Extensions/Index.ipynb

@@ -1,65 +1,57 b''
 {
+ "cells": [
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "<img src=\"../images/ipython_logo.png\">"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "Back to the main [Index](../Index.ipynb)"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "# Builtin Extensions"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "IPython extensions allow custom magic commands to be shipped as standalone libraries. IPython includes a few extensions that define magic commands for working with code in other languages.\n",
+    "\n",
+    "<div class=\"alert\" style=\"margin: 10px\">\n",
+    "We are in the process of moving these builtin extensions to their parent projects (Cython, oct2py and rpy2). Once this happens this documentation will move as well.\n",
+    "</div>"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "## Tutorials"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "* [Cython Magics](Cython Magics.ipynb): magics for compiling and running Cython code in a cell\n",
+    "* [Octave Magic](Octave Magic.ipynb): magics for running Octave code in a cell\n",
+    "* [R Magics](R Magics.ipynb): magics for running R code in a cell"
+   ]
+  }
+ ],
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   "signature": "sha256:a89ddd606f68e27067a5e2301a4d19a3c149131f4f07be4483a65979e26bebe0"
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- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "markdown",
-     "metadata": {},
-     "source": [
-      "<img src=\"../images/ipython_logo.png\">"
-     ]
-    },
-    {
-     "cell_type": "markdown",
-     "metadata": {},
-     "source": [
-      "Back to the main [Index](../Index.ipynb)"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Builtin Extensions"
-     ]
-    },
-    {
-     "cell_type": "markdown",
-     "metadata": {},
-     "source": [
-      "IPython extensions allow custom magic commands to be shipped as standalone libraries. IPython includes a few extensions that define magic commands for working with code in other languages.\n",
-      "\n",
-      "<div class=\"alert\" style=\"margin: 10px\">\n",
-      "We are in the process of moving these builtin extensions to their parent projects (Cython, oct2py and rpy2). Once this happens this documentation will move as well.\n",
-      "</div>"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Tutorials"
-     ]
-    },
-    {
-     "cell_type": "markdown",
-     "metadata": {},
-     "source": [
-      "* [Cython Magics](Cython Magics.ipynb): magics for compiling and running Cython code in a cell\n",
-      "* [Octave Magic](Octave Magic.ipynb): magics for running Octave code in a cell\n",
-      "* [R Magics](R Magics.ipynb): magics for running R code in a cell"
-     ]
-    }
-   ],
-   "metadata": {}
-  }
- ]
+ "nbformat": 4,
+ "nbformat_minor": 0
 }
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