Randomly Delete Old Thumbnails
Created originally on Bitbucket by lambjs (Josh Lamb)
Need to create a config with a % likelihood of deleting thumbs when fetching them.
Config should also indicate if they should be cleaned up after Ajax loads as well as thumb fetches.
Another config option should indicate age threshold
This will cause old thumbs for deleted files to eventually be deleted. Old thumbs for existing files get regenerated.
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