add link to cesium introduction from the TOC

GSoC-2015/Introduction.ipynb

@@ -62,7 +62,7 @@
     "\n",
     "**[Simple web-gis products](Simple web-gis products/Introduction to Simple web-gis products.ipynb)**\n",
     "\n",
-    "   * [CESIUM]()\n",
+    "   * [CESIUM](Simple web-gis products/CESIUM/cesium-introduction.ipynb)\n",
     "\n",
     "\n"
    ]
@@ -70,11 +70,11 @@
   {
    "cell_type": "code",
    "execution_count": null,
-   "metadata": {
-    "collapsed": true
-   },
+   "metadata": {},
    "outputs": [],
-   "source": []
+   "source": [
+    ""
+   ]
   }
  ],
  "metadata": {
@@ -86,7 +86,7 @@
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 2
+    "version": 2.0
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
@@ -98,4 +98,4 @@
  },
  "nbformat": 4,
  "nbformat_minor": 0
-}
+}