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Correct std::tolower warnings under MSVC2017.

Robert Maynard requested to merge robertmaynard/vtk-m:vs2017_warnings into master

Using std::tolower with std::string actually can cause undefined behavior, and only MSVC 2017 looks to complain about it. You can find more information on the exact reason at: http://en.cppreference.com/w/cpp/string/byte/tolower

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