[mlpack-git] [mlpack] k-means should support better handling of empty clusters (#595)

[Ryan Curtin]

We should update the KMeans class so that the EmptyClusterPolicy and _only_ the EmptyClusterPolicy controls what is done with empty clusters.  Two options I plan to implement are:

 * "kill" the cluster by setting it to all DBL_MAX, so it's never used again
 * leave the cluster alone, by simply leaving the centroid in place; this is Erich's (@kno20) suggestion

This comes out of the discussion for #592.

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