Big changes to detection

.gitignore

Makefile

src/cost_layer.c

src/cost_layer.h

src/cuda.c

src/darknet.c

src/data.c

src/detection_layer.c

src/detection_layer.h

src/image.c

src/network.c

src/network.h

src/network_kernels.cu

src/option_list.c

src/option_list.h

src/parser.c

src/softmax_layer.h