fix notebooks to work in firefox

Author: jameswex

colab_facets.ipynb

@@ -57,7 +57,9 @@
     "from IPython.core.display import display, HTML\n",
     "\n",
     "# Create Facets template  \n",
-    "HTML_TEMPLATE = \"\"\"<link rel=\"import\" href=\"/nbextensions/facets-dist/facets-jupyter.html\">\n",
+    "HTML_TEMPLATE = \"\"\"\n",
+    "        <script src=\"https://cdnjs.cloudflare.com/ajax/libs/webcomponentsjs/0.7.24/webcomponents-lite.js\"></script>\n",
+    "        <link rel=\"import\" href=\"/nbextensions/facets-dist/facets-jupyter.html\">\n",
     "        <facets-dive sprite-image-width=\"{sprite_size}\" sprite-image-height=\"{sprite_size}\" id=\"elem\" height=\"600\"></facets-dive>\n",
     "        <script>\n",
     "          document.querySelector(\"#elem\").data = {jsonstr};\n",
@@ -80,21 +82,21 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python 2",
    "language": "python",
-   "name": "python3"
+   "name": "python2"
   },
   "language_info": {
    "codemirror_mode": {
     "name": "ipython",
-    "version": 3
+    "version": 2
    },
    "file_extension": ".py",
    "mimetype": "text/x-python",
    "name": "python",
    "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.5.2"
+   "pygments_lexer": "ipython2",
+   "version": "2.7.16"
   }
  },
  "nbformat": 4,