Add 'car/' from commit 'eee0e8dc445691e600680f4abc77f2814b20b054'

git-subtree-dir: car
git-subtree-mainline: 1d29a5526c
git-subtree-split: eee0e8dc44

car/tracking/readme.txt

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+To load the lidar dummy scans in all_scans.txt,
+use python pickle:
+with open('path/to/all_scans.txt', 'rb') as fp:
+	all_scans = pickle.load(fp)