Do any of the ruby build tools (rake, rant, somethingelse?) support
the task “copy all the files that have changed since the last time i
ran the copy task” across an entire directory tree? e.g. if I have the
the first time i run rake copy, it should copy the entire tree over.
Now say I touch foo/bar/file3, and rerun rake copy, it should only
copy that file over.