Commits on Feb 19, 2019

1. use ::std for tolower, include <cctype> …

   Some C++ compilers don't export C functions into `::` scope. This makes
   `tolower` accessible to those compilers. Also, add `include <cctype>` to
   make sure we are pulling in a header that contains it.
   
   References:
   * https://en.cppreference.com/w/cpp/header#C_compatibility_headers
   * http://www.cplusplus.com/reference/cctype/

   

   girtsf committed Feb 19, 2019
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