[mlpack-git] [mlpack/mlpack] Binarize Function + Test (#666)

[stereomatchingkiss]

There are another solutions could do the binarize, but it need to allocate memoryt

```
arma::mat a, b;
//do something
b.row(0) = arma::conv_to<arma::mat>::from(a.row(0) > 4);
```

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