Issue 28: In parse_number, do not place characters in the std::string one byte at a time.
Issue 28: In parse_number, do not place characters in the std::string one byte at a time.

respu/json-voorhees,tgockel/json-voorhees,respu/json-voorhees,venediktov/json-voorhees,tgockel/json-voorhees,venediktov/json-voorhees