DigitalOcean uses 12.04.3 now instead of 12.04

I'm not sure if this fixes the issue or not, but DigitalOcean doesn't have a Ubuntu 12.04 box. I was able to manually edit the config.yaml file in my ./puphpet directory and change the box string to 12.04.3, and it worked. I ran a find -exec grep "Ubuntu 12.04" on the src directory, and this is the only instance I found.