GitLab

- required for using Levenshtein

- Add ThumbnailImageStorage
- Refactor CroppedImageStorage (backwards compatible)
- Add post_processing option
  - Add MozJPEG Postprocessor, compress image to JPEG using mozjpeg library

- error.args[0] can be anything, isnt always a string
- only translate error message if set

- Setting HTTP_ERROR_INCLUDE_CLASS_NAME to enable or disable this feature
- Wrap error response data in "error" dict, enable or disable with HTTP_ERROR_WRAP_IN_ERROR_DICT setting

- ability to preset code or status_code by a child error class

Crops the uploaded image to the given size in resize_to parameter
using a given resample method and saves it as png file and returns
its sha256 hash hexdigest