change all uris to next branch
remove vagrant profiles
move clock to base
use UUIDs in fstab
add support for legacy MBR
add new kernel config with ec2 (xen) support
add ec2 common
hardcode /dev/xvda1 for EC2 pv-grub boot
Merge branch 'next'
Revert "change all uris to next branch"

This reverts commit 93ef7b2660633fc6ec2e9805775b6765a909f981.

Conflicts:
	profiles/common/base.sh
	profiles/vagrant-chef-server.sh