[Feature Request] Utility function randomized filenames

[negativefix]

I realized that filer.utils.generate_filename.randomized utility function only generates randomized folder structure and keeps the original name of the file uploaded. But I felt a little uncomfortable keeping the original file names when I am uploading large number of images. It's not because I am worried about collision or something but I am little bit obsessive about that my filenames should follow a pattern. I thought it would be good if filer had provided it. It could be another simple utility function which may generate filenames as below.

ext = filename.split('.')[-1]
filename = "%s.%s" % (uuid.uuid4().hex, ext)

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