lufa + contiki, first steps

use contiki as a base and integrate lufa as a library. requires two
patches to get rid of all usb and cfs stuff in contiki for avr-ravenusb:

24a7ab5b24daf15452b6a22ba1d6bbe03d4ee680
1e1adbb63e5573a59440bd912ce09f36a9a4c1e6

rough usage notes:
make libzeigefinga.a  # compile static lib with lufa stuff
make zeigefinga       # compile contiki binary (with lib linked in)
make avrdude          # upload with jtag2

ENTIRELY UNTESTED because I didn't have a programmer available!
avr-ravenusb: udp broadcast listener, stub-ish
rename lufa -> raven