Msgcheck

Changed

- **Breaking**: add argument id/str for `-s`/`--spelling` to check messages or translations

Added

- Add pylint checks for Travis CI

Fixed

- Ensure pwl is not None before checking if file exists
- Exit immediately if pwl file does not exist

Added

- Add tests with Travis CI
- Code refactoring, add setup.py and tests

Fixed

- Fix return code when there are more than 255 files with errors

Changed

- Code cleanup

Added

- Add option `-W` (or `--no-whitespace-eol`) to not check trailing whitespace at end of lines inside strings

Fixed

- Fix error with `--spelling`

Changed

- Add a main function