Integrate chromebook/chromebook-next into branch for pull request.
Unified builds (multi-dtb) uImages for Snow/Spring

kernel.its now builds one uImage with dtb for both systems (3 dtbs actually as snow now has 2 dtbs).  uBoot should select the right one - it does on the Spring.
THIS NEEDS TESTING ON SNOW.
Switch PKGBUILD to fetching git snapshot.

I haven't finished a full test build of this yet, but it fetches and begins building.  I'll run through a full build test tomorrow.  No config changes were made so the test is really to make sure all of the cp's and mv's still have paths that make them happy.
Remove linux-chromebook-next

The 3.8 branch is fun to play with, but I don't think it's as ready from primetime as the linux-chromebook 3.4 branch.  I've been  using 3.4 branch for day to day on the HP and it seems fine (other than no RTC or TPM which need 3.8).
Remove snow/spring.its. kernel.its now adds both dtb's.

These were from before I started with a multi-dtb FIT image.
Merge branch 'for_pull_request'