Version 1.5.0

Added fix when composite image is incorrectly saved as all white pixels

Version 1.4.0

Fixed generating thumbnails when file contains uncompressed composite image (ex. saved by Paint.NET)

Version 1.3.0

- Fix issues with file locking
- Add using main composite image when document is small
- Add using scaled down main composite image when thumbnail is missing
- Add test application
- Refactor thumbnail generation into separate file

1.2.1

Initial commit