* Added python3 shebang
* Renamed the script `unity_to_junit.py` as `stylize_as_junit.py`
to match the Ruby file
* Fixed a bug on where the script failed if the first entry slot of
each result line is empty. Now falls back to the result file name
* Rewrote the argument parsing to use argparse
* Added a `--output` / `-o` option, to match the Ruby file
