Fixes for small objects. And fixes of densenet201_yolo.cfg, resnet50_yolo.c...

AlexeyAB

2018-03-08 a6c51e3b758aee7fd3a6f1d37daa8dcad4891e52

 build/darknet/x64/yolo-voc.cfg

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