New features for FileReader && FileWriter

  - FileReader
    * Introduce JSON debugging methods: dump_key, dump_value, dump

    * Introduce boolean argument for enabling parsing of C-style
comments in a JSON file; default is to disable parsing comments

  - FileWriter
    * Introduce stringify method
Introduce nomlib_init function

* Rename File::setPath to set_path & change return type from void to
bool

* Update examples to use nomlib_init
Remove accidental double setting of header files

* Math & system header files were being set twice -- oops!