Updated DigitalOcean default image id
Updated DigitalOcean default image id

It looks like DigitalOcean replaced the "Ubuntu 12.04" image with "Ubuntu 12.04.3".  We've updated the ImageID to point to the new image.
suma/packer,Kaixiang/packer,suma/packer,Kaixiang/packer,suma/packer,Kaixiang/packer,Kaixiang/packer,suma/packer