[mlpack-git] [mlpack/mlpack] use constexpr to replace static const (#612)

stereomatchingkiss notifications at github.com
Tue Apr 12 16:03:06 EDT 2016

I prefer constexpr because I hope the variables can be initialize at compile time, as [this post](http://stackoverflow.com/questions/13346879/const-vs-constexpr-on-variables) stated, but I may wrong, the compilar may not do what I think it should.

ps : on vc2015, static const double and constexpr, both of them can evaluate at compile time

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