Vagrant 1.0 used instead of the newest version

Really helpfull hands on today with the varnish training, but couldn't help but notice you were still using the 1.0 syntax for Vagrant. So i updated it to a Vagrant 1.1 compatible version which is supported untill version 2.0 according to Vagrant's documentation.

Vagrant 1.0 is no longer supported but it is still backwards compatible but could break in the near future.