Still remains to be seen why i2cmaster.c and adxl345.c need to be added
in the Makefile.common at the very beginnig with the env. var.
PROJECT_SOURCEFILES += i2cmaster.c adxl345.c
cc2420 isr handled at cc2420-arch, disabled accel. interrupts and modified
platform/z1/contiki-conf.h to use same mac as sky.
Added example-broadcast-button, sends packets every second or when button pushed.
Works with other Z1s and Sky