Fix Vagrantfile for Vagrant 1.3.4 using 'Vagrant.configure('2') syntax

The Vagrantfile was failing with Vagrant 1.3.4. This Vagrant file works. 

However, I could not get the hostname directive to work, even after changing the syntax to `hostname` from `host_name`. I finally just commented. Whenever the `vagrant up` was run with the host name directive uncommented, the VM would be created and the provision would never run.