- When a file is removed from storage that does not exist, the operation does not throw an exception any longer. This is in line with the behaviour of boto.
- Behaviour of removing files was changed: Files are only removed from storage when the model is saved and not prematurely whenever the file is removed from the form.
- Adds mime type lookup to form, which allows developers to define a list of file extensions and their corresponding mime types that are allowed for upload.