Cleaning results folder when no failures

[jplahn]

Is there a way to do this already, or are there plans to add an option in the grunt file or init function to delete all of the images in the "results" directory that are produced when all tests pass (or for the tests that pass)? I suppose I could do it manually afterwards, but it seems like it would be a nice, clean way to prevent a large number of images being saved for no reason.

Again, this may have already been done..