Increase box memory size to 2 GB

I was having a problem where mysql or php would exit on an out of memory error.  Increasing the memory to 2 GB seems to have fixed it for now.  I also changed the box to the image at vagrantup.com because the `config.vm.hostname` setting didn't seem to work on the box from ubuntu.  Like, it wouldn't set the fqdn or the `/etc/hosts` file.  I have no idea why.