Add missing TWI_Init() call to the TemperatureDataLogger project. Make DUMMY_RTC compile time option the default, so that it works correctly on the USBKEY and other Atmel boards out of the box.

Projects/TemperatureDataLogger/TempDataLogger.c

@@ -199,6 +199,7 @@ void SetupHardware(void)
 	Temperature_Init();
 	Dataflash_Init();
 	USB_Init();
+	TWI_Init();
 	
 	/* 500ms logging interval timer configuration */
 	OCR1A   = ((F_CPU / 1024) / 2);