demo: Install the latest version in provisioner

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
util/packer: Add boxes to gitignore

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
host: Don’t automatically start upstart job

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>
Vagrantfile: Don’t worry about flynn-host upstart job

Signed-off-by: Jonathan Rudenberg <jonathan@titanous.com>