[Matlab] segmentGroundFromLidarData

[1] Bogoslavskyi, I. “Efficient Online Segmentation for Sparse 3D Laser Scans.” Journal of Photogrammetry, Remote Sensing and Geoinformation Science. Vol. 85, Number 1, 2017, pp. 41–52. (Depth Clustering과 연관, https://github.com/PRBonn/depth_clustering/blob/master/readme.md)