update to fix the 128rfa1 and raven port of contiki 

As requested an update cherry picked to match your repository.
In this distro, it should be possible to set up a zigduino as rpl border router using tunslip6, and then set up an other zigduino as webserver using the webserver-ipv6-raven example.

For zigduino programming i use the latest version of avr dude, which allows me to just do "webserver6.u" to compile and program 

Br,
Jef