Workaround for ROS kinetic / OpenCV 3#6

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jitrc wants to merge 3 commits intokunle12:masterfrom

Commits on Jul 22, 2017

darknet without OpenCV as C on openCV 3 and CUDA does not work in darkent
Jit Ray Chowdhury
committed
auto detect version of opencv for including headers
Jit Ray Chowdhury
committed
adding ipl_to_image to make the code work without OpenCV
Jit Ray Chowdhury
committed