bump(coreos-base/vboot_reference): small cgpt update
bump(coreos-base/cros-devutils): Various fixes for /usr images.
fix(sys-kernel/coreos-kernel): Install kernel image to /usr/boot

/boot is not included in /usr images
remove(coreos-base/coreos-installer): replaced by a small shell script

The tools this provided are moving to update_engine.
bump(coreos-base/update_engine): Support for /usr images
Merge pull request #410 from marineam/usr

Upgrade support for /usr
add(sys-firmware/edk2-ovmf): Add UEFI firmware for QEMU

To use either run qemu with:
  -bios efi-bios.bin
Or:
  -L path/to/usr/share/edk2-ovmf

The latter is useful if you want to use the OVMF built by the SDK
outside of the SDK. Using UEFI with the QEMU instance inside the CoreOS
SDK is kinda awkward because serial doesn't work and UEFI uses a VGA
graphics framebuffer mode, not VGA text mode so -curses doesn't work
either. In any case, it is a start.
fix(profiles): Unmask newer versions of SYSLINUX
bump(sys-firmware/edk2-ovmf): Update to new snapshot
bump(coreos-base/cros-devutils): Now includes chromeos-common.sh

This file was previously installed by the coreos-installer package.
fix(coreos-base/*): Clean up cros-installer and cros-factoryutils

cros-installer has already been removed, clean up lingering references.
cros-factoryutils installed nothing, just remove the ebuild.
Merge pull request #411 from marineam/syslinux

Syslinux and UEFI
Merge pull request #412 from marineam/quickfix

Fix cros-installer removal
wip, add nova-agent-watcher powered by cloudinit
feat(rackspace): update rackspace to use cloudinit