dfu-util: add head

gnumonks.org has been unreachable for the past week or two - not sure whether that’s still the project home, but the committers appear to be active on gitorious
i couldn't find a prepared release archive available on gitorious, but https://gitorious.org/dfu-util/dfu-util/archive/a0a3668e0571a9b007f7d62b01e7dcfd7754ce50.tar.gz points to the repo at the v0.7 tag.

does this seem worth updating?