[mlpack] [mlpack/mlpack] faster build times (#841)

[Ryan Curtin]

I merged from master with

```
git remote add upstream https://github.com/mlpack/mlpack.git
git fetch upstream
git merge upstream/master
```

and to resolve the conflict with `spherical_kernel.hpp` I changed the includes on that file to just `#include <mlpack/prereqs.hpp>` and this works for a compile.  The boost header isn't necessary anymore---when I went through a few weeks back to try and accelerate compile time a little, I was able to just use `std::tgamma()` instead, so that header is no longer necessary.

Maybe the problem you are seeing is a result of old compile artifacts or something and the build directory needs to be cleaned?  If you can reproduce it, let me know what version of Boost so I can try and reproduce also.

When I do some timing comparisons, making just the core library takes 4m55s of user time instead of 6m21s, a nice improvement. :)

The real speed killer, I think, is all of the boost headers.  I have a dream of managing to un-include any boost headers (including boost serialization) from any file that isn't directly using boost functionality, and I've made some steps in that direction, but it's difficult.  Anyway, this is a nice step.

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