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

[Ryan Curtin]

I should also say, you won't see much speedup for a 10x10 matrix, try more like 10000 points and 100 features.  I think that you would also be benefited by looping columnwise instead:

```
#pragma omp parallel for
for (size_t i = 0; i < mat.n_cols; ++i)
{
  // Each threads works on a single column.
  for (size_t j = 0; j < mat.n_rows; ++j)
  {
    if (mat(j, i) < threshold)
      outmat(j, i) = 0;
    else
      outmat(j, i) = 1;
  }
}
```

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