Made Appendix show up as Appendix!

Just needed to add literal latex into the file with the %%latex magix.

Appendix_A_Installation.ipynb

@@ -7,6 +7,31 @@
     "[Table of Contents](http://nbviewer.ipython.org/github/rlabbe/Kalman-and-Bayesian-Filters-in-Python/blob/master/table_of_contents.ipynb)"
    ]
   },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "metadata": {
+    "collapsed": false
+   },
+   "outputs": [
+    {
+     "data": {
+      "text/latex": [
+       "\\appendix"
+      ],
+      "text/plain": [
+       "<IPython.core.display.Latex object>"
+      ]
+     },
+     "metadata": {},
+     "output_type": "display_data"
+    }
+   ],
+   "source": [
+    "%%latex\n",
+    "\\appendix"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},