[mlpack-git] [mlpack] Reduce (or fix) warnings when compiling with Visual Studio (#554)

[Cloud Han]

hmm, on my local test, `conversion from 'size_t' to 'const arma::uword', possible loss of data` is eliminated when `ARMA_USE_CXX11` is enabled and `ARMA_64BIT_WORD` remain disabled by default. I think you'd better test it on appveyor?

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