added class files
added isPowerOn method, possibility to use multiple power pins, and Dummy signals powerOn() at Boot.booted
use ArbitratedReadC instead of ResourceReadC
completly rewritten driver with better arbitration. Also usable with STS21
added conversion modules for sht2x. Simplified ucmini test app a bit
added conversion modules for atm128rfa1 temperature sensor
added license
Fixed whitespaces and licenses
Merge branch 'ucmini_sensors'