chore(vboot_reference): strip out a lot of unneeded logic

we essentially only use vboot_reference for cgpt right now. Strip
everything else out.
feat(coreos-base/vboot_reference): bump to get cgpt next

bump to get the cgpt next utility
Merge pull request #81 from coreos/bump-vboot-ref-for-cgpt-next

Bump vboot ref for cgpt next
fix(vboot_reference): mask vboot-9999

bad mistake unmasking this. Reset the mask.
add(sys-devel/sysroot-wrappers): Add new sysroot-wrappers tool.

This replaces the previous sysroot wrapper scripts that was bundled with
the Google toolchain. This one is implemented in a more generic manner
and based on ccache. Perhaps other custom wrapper scripts will
eventually move into this package as well.
Merge pull request #82 from marineam/wrappers

add(sys-devel/sysroot-wrappers): Add new sysroot-wrappers tool.
Merge pull request #80 from gregkh/boot_kernel_update

feat(sys-kernel/coreos-bootkernel) bump version and add initrd to built ...