moved some gitignore files from main repo to here

Author: jwmueller

.gitignore

@@ -16,3 +16,6 @@ outlier_detection_cifar10/cifar10_test.tar.gz
 outlier_detection_cifar10/cifar10_test/
 entity_recognition/conll2003.zip
 entity_recognition/folds/
+contrib/v1/imagenet/img
+contrib/v1/cifar10/img
+contrib/v1/amazon_reviews_dataset/pickles