Add 'universe/' from commit '8ad51b24dd'

git-subtree-dir: universe
git-subtree-mainline: 15110e6de9
git-subtree-split: 8ad51b24dd

universe/data_structures_and_algorithms/plot.py

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+import numpy as np
+import matplotlib.pyplot as plt
+
+rng = np.random.RandomState(10)  # deterministic random data
+a = np.hstack((rng.normal(size=1000), rng.normal(loc=5, scale=2, size=1000)))
+_ = plt.hist(a, bins='auto')  # arguments are passed to np.histogram
+plt.title("Histogram with 'auto' bins")
+Text(0.5, 1.0, "Histogram with 'auto' bins")
+plt.show()