Exit with nonzero status on error

Bartek Gąsiorzewski

2018-05-07 ae4ec1a06d5b4c9bcb5647cf555aafd4e5f800f7

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classes= 20
train  = data/train_voc.txt
valid  = data/2007_test.txt
#difficult = data/difficult_2007_test.txt
names = data/voc.names
backup = backup/