Added trim() function for label paths

AlexeyAB

2018-08-20 e1801f5aec1373475682fa4d0850a3469dab6ef7

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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/