Remove tutorials from main repository.

* They now live at https://github.com/caffe2/tutorials
* Updating caffe2.ai website to match in a separate commit.

Author: orionr

.gitattributes

@@ -62,18 +62,6 @@ fi
 
 exit_code=0
 
-cd "$ROOT_DIR"/caffe2/python/tutorials
-python tutorials_to_script_converter.py
-git status
-if git diff --quiet HEAD; then
-  echo "Source tree is clean."
-else
-  echo "After running a tutorial -> script sync there are changes. This probably means you edited an ipython notebook without a proper sync to a script. Please see caffe2/python/tutorials/README.md for more information"
-  if [ "$exit_code" -eq 0 ]; then
-    exit_code=1
-  fi
-fi
-
 cd "$ROOT_DIR"
 
 if [ -d ./test ]; then