[mlpack-git] [mlpack/mlpack] fix default output problem and some styles (#680)

[Ryan Curtin]

> @@ -34,8 +34,8 @@ PROGRAM_INFO("Fast Euclidean Minimum Spanning Tree", "This program can compute "
>      "column corresponds to the distance between the two points.");
>  
>  PARAM_STRING_REQ("input_file", "Data input file.", "i");
> -PARAM_STRING("output_file", "Data output file.  Stored as an edge list.", "o",
> -    "emst_output.csv");
> +PARAM_STRING_REQ("output_file", "Data output file.  Stored as an edge list.",
> +    "o");

We shouldn't require the user to specify and output file, but we should print a warning ("output will not be saved", I think mlpack_knn does this) if they don't specify -o.

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