Fix np memory issues and rename k_means to kmeans

Decreased the memory cost of certain operations of kmeans. Fixes #37 (closed)

Renamed k_means.py as kmeans (Fixes #40 (closed))

Also fixes #42 (closed)

assigned to @ydayer

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LGTM

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• 06d5d386 - close dask client to see if it prevents tests hanging

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"close dask client to see if it prevents tests hanging"
Good point. I don't know why sometimes it just waits.

I'm also working on making the weights_and_variances computation distributed, in a similar fashion as the e-m steps in the fit method. (Right now, it's really slow)

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merged

mentioned in commit c1f5c558

Looks like it fixed it!