delete-file: Implement file deletion.
delete-file: Bump to 0.91.1.
delete-file: Handle 404 on delete().
delete-file: regression tests on delete (204 and 404).
delete-file: Add test for delete() when Thumbor server does not allows deletion.
delete-file: ThumborMigrationStorage.delete(): proxy-switch to ThumborStorage or FileSystemStorage.
delete-file: README++.