Concludes BlobDetection tests

	modified:   pandora_vision_hole_detector/include/utils/blob_detection.h
	modified:   pandora_vision_hole_detector/src/hole_fusion_node/hole_fusion.cpp
	modified:   pandora_vision_hole_detector/src/utils/blob_detection.cpp
	modified:   pandora_vision_hole_detector/src/utils/hole_filters.cpp
	modified:   pandora_vision_hole_detector/test/unit/utils/blob_detection_test.cpp