[mlpack-git] [mlpack/mlpack] add train test split (#523)

[Ryan Curtin]

> +  /**
> +   * @brief TrainTestSplit
> +   * @param testRatio the ratio of test data
> +   * @param seed seed of the random device
> +   * @warning slice should not less than 1
> +   */
> +  TrainTestSplit(double testRatio,                
> +                 arma::arma_rng::seed_type seed = 0) :
> +    seed(seed),    
> +    testRatio(testRatio)
> +  {    
> +  }
> +
> +  /**
> +   *Split training data and test data, please define
> +   *ARMA_USE_CXX11 to enable move of c++11

mlpack requires C++11 so I think we can assume that `ARMA_USE_CXX11` is enabled without any issues.

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