Added trim() function for label paths

AlexeyAB

2018-08-20 e1801f5aec1373475682fa4d0850a3469dab6ef7

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#rm test_dnn_out.avi
 
./darknet detector demo ./cfg/coco.data ./cfg/yolov3.cfg ./yolov3.weightss rtsp://admin:admin12345@192.168.0.228:554 -i 0 -thresh 0.25