Riot OS -- workable code for Spark-Core

Hi Anwesh,

please always write to the RIOT mailing list to get help!

I did the initial support for this boards more than a year ago, so the only documentation I have is:

For more help, please ask kindly at the mailing list.

In case a RIOT developer from Berlin wants to have my spark to finish the RIOT support, I'm open to donate mine.

Best Christian