Fix example notebook

Author: SylvainCorlay

.gitignore

@@ -1,3 +1,6 @@
+# Jupyter
+.ipynb_checkpoints/
+
 # Prerequisites
 *.d
 

notebooks/intensely_edgy_cat.ipynb

@@ -26,7 +26,11 @@
     "// for displaying images (see xtensor-io and xeus-cling demos)\n",
     "#include <string>\n",
     "#include <fstream>\n",
-    "#include <xtl/xbase64.hpp>"
+    "#include <xtl/xbase64.hpp>\n",
+    "\n",
+    "#include \"nlohmann/json.hpp\"\n",
+    "\n",
+    "namespace nl = nlohmann;"
    ]
   },
   {
@@ -43,16 +47,16 @@
     "    std::stringstream buffer;\n",
     "    buffer << fin.rdbuf();\n",
     "\n",
-    "    xeus::xjson mime;\n",
+    "    nl::json mime;\n",
     "    mime[\"image/png\"] = xtl::base64encode(buffer.str());\n",
-    "    xeus::xjson transient;\n",
+    "    nl::json transient;\n",
     "\n",
     "    if (update)\n",
     "    {\n",
     "        transient[\"display_id\"] = id;\n",
     "        xeus::get_interpreter().update_display_data(\n",
     "            std::move(mime),\n",
-    "            xeus::xjson::object(),\n",
+    "            nl::json::object(),\n",
     "            std::move(transient));\n",
     "        return id;\n",
     "    }\n",
@@ -62,7 +66,7 @@
     "        transient[\"display_id\"] = id;\n",
     "        xeus::get_interpreter().display_data(\n",
     "            std::move(mime),\n",
-    "            xeus::xjson::object(),\n",
+    "            nl::json::object(),\n",
     "            std::move(transient));\n",
     "        return id;\n",
     "    }\n",
@@ -419,16 +423,16 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "xeus C++14",
-   "language": "",
-   "name": "xeus-cling-cpp14"
+   "display_name": "C++14",
+   "language": "C++14",
+   "name": "xcpp14"
   },
   "language_info": {
    "codemirror_mode": "text/x-c++src",
    "file_extension": ".cpp",
    "mimetype": "text/x-c++src",
    "name": "c++",
-   "version": ""
+   "version": "14"
   }
  },
  "nbformat": 4,