Buildsystem is now using avr-ar
SPI Update:

    added slave mode support
    regmap support for atmega128rfa1 and at90can128
Intra robby communication support:

    added spi based intra robot communication
    added example with master and slave
    added new platform for robby communication module
Merge pull request #1 from apfohl/ar-fix

Buildsystem is now using avr-ar