Added support for SPI slave
Added interupt support for slave SPI mode
Fixed minor bugs with PIN configuration
Added check in SPI configuration of transmission size
Removed wait time from SPI Flush rx, no need to wait there
Added SPI master slave example. With 2 SMARTRF06 SPI master slave operation can be checked
Fixed smartrf06 accelerometer driver (not tested for calibrated)
added example with accelerometer
added server for internet updates over spi