[mlpack-git] [mlpack/mlpack] string util seems to be unused anymore (#685)

[Keon Kim]

I left this unchanged because it felt I need to ask this before just deleting it.

 * [string_utill.hpp](https://github.com/mlpack/mlpack/blob/d2e353468b8fce9fc1ee46799860f3860c4c8db9/src/mlpack/core/util/string_util.hpp) 

* [string_util.cpp](https://github.com/mlpack/mlpack/blob/master/src/mlpack/core/util/string_util.cpp)


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