REF: reimplement mrr on top of shapely #133
Merged
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Resolves the issue seen in pysal/libpysal#681 where opencv causes installation headache. Since we already depend on shapely, there's no need to depend on OpenCV, so using shapely's minimum_rotated_rectangle, computing the angle manually and coercing the resulting array into the opencv-like order (which is the opposite compared to shapely).