Merge pull request udacity#66 from esteveste/fix_exercise

Fixed instructions to make them more clear.

intro-to-pytorch/Part 7 - Loading Image Data (Exercises).ipynb

@@ -150,7 +150,7 @@
     "\n",
     "You can find a list of all [the available transforms here](http://pytorch.org/docs/0.3.0/torchvision/transforms.html). When you're testing however, you'll want to use images that aren't altered (except you'll need to normalize the same way). So, for validation/test images, you'll typically just resize and crop.\n",
     "\n",
-    ">**Exercise:** Define transforms for training data and testing data below."
+    ">**Exercise:** Define transforms for training data and testing data below. Leave off normalization for now."
    ]
   },
   {