[mlpack-git] [mlpack] GaussianDistribution should cache covariance matrix factorization (#385)

[Stephen Tu]

Ugh I thought this was going to be a trivial fix, but it turns out there are several places in the codebase doing the `dist.Covariance() = x` or stashing an lvalue reference to `dist.Covariance()`. I'll have to analyze each case separately and probably refactor some code. Point is, might take longer than I thought. 

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Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/issues/385#issuecomment-70616599
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