Change default kernel gcc version to 4.7... in the grossest way possible.

Change-Id: I039fef345a7a470d0d5769ebb79c252d09a38a99
INTRODUCING: Vanir BOTTLESERVICE

vanir's kernel-only bash monstrosity that emulates cm's roomservice with the following differences:
-kernels only
-all information is derived from existing files in the device trees (TARGET_KERNEL_SOURCE in the device BoardConfigs)
-multiple remote repositories supported via a helper script in the manifest repo

Average kernel repos are ~500 MB, so this ought to drastically reduce the initial sync size, and reduce the overall
storage for developers that don't build EVERY device.

ps90: error handling (and name calling)

Change-Id: I66afb901c97d0add42cb44c28261856de48493aa