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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