Trash files

WAY-54
- review WAY-54
- fix test WAY-54
Merge pull request #17 in WAY/way-gdrive from WAY-54-trash-files to master

* commit '5b2d77b04b2d1b79e297b374090fefc6f0c6a11a':
  - fix test WAY-54
  - review WAY-54
  Trash files
ChangeId.of(File) and ChangeId.write(File)

WAY-54