[mlpack-git] [mlpack/mlpack] Adds a GammaDistribution object for estimating gamma parameters (#729)

[Yannis Mentekidis]

> @@ -0,0 +1,76 @@
> +/**
> + * @file gamma_distribution.cpp
> + * @author Yannis Mentekidis
> + *
> + * Implementation of the methods of GammaDistribution.
> + */
> +#include "gamma_distribution.hpp"
> +
> +#include <boost/math/special_functions/digamma.hpp>
> +#include <boost/math/special_functions/trigamma.hpp>

I replaced trigamma(.) with polygamma(2, .) to see if that works. According to [this](http://mathworld.wolfram.com/PolygammaFunction.html), I could avoid including it completely and compute it using digamma. I'm trying that while travis attempts to build the new version.

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