Added a cumulative sum function to Histogram#29

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xd009642 wants to merge 3 commits intorust-ndarray:masterfrom

xd009642:hist_cdf

Commits on Feb 26, 2019

Added a cumulative sum function to Histogram
xd009642
committed

Commits on Feb 27, 2019

Made CDF n-dimensional
xd009642
committed

Commits on Feb 28, 2019

Added 2D CDF test for histogram
xd009642
committed