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

[Tham]

I think this behavior can adjust from map policies.

```
//please give it a better name if you can
class IncrementSpecificTargetPolicy
{
 public:
  typedef size_t mapped_type;

  explicit IncrementSpecificTargetPolicy(std::set<std::string> specificString) : 
    specificString(std::move(specificString)) {}

  template <typename MapType>
  mapped_type MapString(MapType& maps,
                       std::vector<Datatype>& types,
                       const std::string& string,
                       const size_t dimension)
  {
    // If this condition is true, either we have no mapping for the given string
    // or we have no mappings for the given dimension at all.  In either case,
    // we create a mapping.
    if (specificString.count(string) != 0 && (maps.count(dimension) == 0 ||
        maps[dimension].first.left.count(string) == 0))
    {
      //do your jobs
    }
  }

private:
  std::set<std::string> specificString;  
}; // class IncrementPolicy
```

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