Fixed example in Exporting tutorial

Author: jlstevens

doc/Tutorials/Exporting.ipynb

@@ -1,7 +1,7 @@
 {
  "metadata": {
   "name": "",
-  "signature": "sha256:684938ea66d4b632e35b5000d98d50493273c987c485cb20286d269dae6fe654"
+  "signature": "sha256:faccd988401d9e0fa73dc5313f5121ff1ded52490dce4e038073dcd30d3d169f"
  },
  "nbformat": 3,
  "nbformat_minor": 0,
@@ -415,12 +415,12 @@
      "collapsed": false,
      "input": [
       "import os\n",
-      "from holoviews.core.options import Store\n",
+      "from holoviews.core.io import Unpickler\n",
       "c,a=None,None\n",
-      "path=\"Exporting/Levels_0.1-0.8,Overlay,Image,Level.pkl\"\n",
+      "path=\"Exporting/Levels_0.1-0.8,Overlay,Image,Level.hvz\"\n",
       "\n",
       "if os.path.isfile(path):\n",
-      "    o = Store.load(open(path,\"r\"))\n",
+      "    o = Unpickler.load(open(path,\"r\"))\n",
       "    c = o.Image\n",
       "print(repr(c))"
      ],
@@ -463,4 +463,4 @@
    "metadata": {}
   }
  ]
-}
+}