Use new notebook exclusion in treon==0.1.3

Author: natanlao

.travis.yml

@@ -13,13 +13,8 @@ install:
 - pip install -r test/requirements-dev.txt
 - find . -name "requirements.txt" -exec pip install -r "{}" \;
 
-before_script:
-# To ignore a directory, we can just delete the directory
-# so that treon doesn't see it.
-- xargs -t rm -rf < test/ignore
-
 script:
 # Test that notebooks run successfully
-- treon
+- treon $(awk '{printf " --exclude " $0}' test/ignore)
 # Naive test to check that output committed with notebook-
 - find . -name "*.ipynb" -exec sh test/test_output.sh "{}" \;