replacing umlaute and fixing address in headers Haldeneggsteig -> Universitaetsstrasse

Signed-off-by: Reto Achermann <reto.achermann@inf.ethz.ch>

Added files for HID support. Added service export for keyboard.

--HG--
rename : include/usb/class/usb_hdi_request.h => include/usb/class/usb_hid.h
rename : lib/usb/class/usb_hub_request.c => lib/usb/class/usb_hub.c