grub: add ebuild for latest snapshot of grub

Lots of bug fixing has gone in since beta2 was released in December.
vboot_reference: add grub bios partition type to cgpt
Merge pull request #828 from marineam/grub

grub: add ebuild for latest snapshot of grub
coreos-base/coreos-cloudinit: bump to v0.9.5
coreos-base/oem-digitalocean: Add DigitalOcean OEM
Merge pull request #829 from crawford/digitalocean

coreos-base/oem-digitalocean: Add DigitalOcean OEM
coreos-base/coreos-cloudinit: bump to v0.9.6
Merge pull request #830 from crawford/cloudinit

coreos-base/coreos-cloudinit: bump to v0.9.6
util-linux: fix intermittent build failure

This has been killing builds every once and a while for a long time.
ktop: Install into /usr/sbin, not /usr/local/sbin

This preemptively fixes a Gentoo QA warning that will be introduced in
future versions of portage.

Signed-off-by: Richard Yao <richard.yao@clusterhq.com>
Merge pull request #832 from ryao/ktop

ktop: Install into /usr/sbin, not /usr/local/sbin
Merge pull request #831 from marineam/build

util-linux: fix intermittent build failure
Merge pull request #827 from gregkh/kernel_update

coreos-kernel: bump to 3.16.1
etcd: drop [Install] section from unit
fleet: drop [Install] section from unit
Merge pull request #809 from bcwaldon/remove-install-sections

Remove fleet/etcd [Install] sections
coreos-kernel: roll back to previous 3.15.8 kernel

The new kernel completely failed to boot on EC2 as a Xen PV instance.
Rolling back until we figure out what is going on.

Boot log: https://gist.github.com/marineam/50f92ded40e02c163c19
Merge pull request #834 from marineam/revert

coreos-kernel: roll back to previous 3.15.8 kernel
fleet: add fleet.socket
Merge pull request #833 from bcwaldon/fleet-socket

Add fleet.socket