Fixed of using backslash (\) in paths to cfg for training

AlexeyAB

2017-10-01 d1a5905c61c12c86e4bf9e2b1174d00d8a16fb6e

 build/darknet/x64/yolo-voc.cfg

@@ -256,3 +256,4 @@
absolute=1
thresh = .6
random=1