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

[Yannis Mentekidis]

So far I have backported these files:
```
bernoulli.hpp
math_fwd.hpp
policy.hpp
polygamma.hpp
trigamma.hpp
detail/bernoulli_details.hpp
detail/polygamma.hpp
detail/unchecked_bernoulli.hpp
```

In some of these (`bernoulli.hpp`, `detail/unchecked_bernoulli.hpp`, `trigamma.hpp`) the file `math_fwd.hpp` was included, which contains forward declarations. This was supposed to stop the "xyz is not a member of boost::math::..." errors, but in many cases it didn't. I don't understand why, since that file did contain all the forward declarations these files are unable to see.

Anyway, I started hard-coding the declarations by hand at the top of files. This resolved a number of errors, I'll keep doing it to see if I can end up with a passing build.

If, though, someone has any insight as to why this is happening, I would be very happy to implement a simpler solution, both because my fix is ugly and because I'm not sure it will ever work.

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