Version 2.0.4

Version 2.0.3

version 2.0.2

Version 2.0.1: Fix a black opacity bug and add exceptions to help deb…

…ugging

- Tag versions of ImageWorkshop with git

Change the version of ImageWorkshop

Adding an ImageWorkshopException class in the project to manage excep…

…tions

Version 1.3.0: allows horizontal or vertical flip