Move build scripts to an external git repo & Version 1.1.20

This cleans up most of the changes that were bolted in to make
the kernel say "cubed".

This removes all the makefile rules I added for DNA specific
building.

Updated README.md to explain how to build the kernel now.

Conflicts:
	Makefile

Conflicts:
	Makefile
Version 1.0.20
Make defconfig configurable
Update to include the FLASH_BOOT