iBeacon power measurement support

Fix for ADC and SPI Cleanup

iBeacon Support

PPI channel and wire speed enhancement

Fix for the UART stops receiving bytes after some time with BLE enabled

RFduino to RFduino

fixes for pinWakeCallback, incorrect return types for rfduino_ calls,…

… and max sketch size

added getDeviceId()

i2c fix. RFDLoader 32-bit.

Added flash memory support