Major update to support ZNP

This update adds support of ZNP on both
CC2538 and CC2530 for both UART and
SPI. The differences are handled through
difference in the configuration file only.

Many configuration files have been added
for easier use. Also for use with Linux Kernel
3.8 and above device tree overlays have been
added. Some upstart scripts are also available
now for use with later versions of Ubuntu and
other Debian based OSs.