[mlpack-git] [mlpack/mlpack] DatasetMapper & Imputer (#694)

[Keon Kim]

> +#include <limits>
> +
> +
> +using namespace std;
> +
> +namespace mlpack {
> +namespace data {
> +
> +/**
> + * Same as increment map policy, but does not change type of features.
> + */
> +class MissingPolicy
> +{
> + public:
> +  // typedef of mapped_type
> +  using mapped_type = double;

@zoq it is because mappings can be any type of pairs. DatasetMapper takes care of mapping string values to any type of numeric values. 
For example, IncrementPolicy defines mapped_type as size_t. Therefore the DatasetMapper knows how to map and [return](https://github.com/mlpack/mlpack/pull/694/files#diff-4654fc03017f8f55e68d7e012a8c74f9R78) the data. (string to size_t mapping)
However, MissingPolicy uses NaN so the mapped_type is defined as double.  

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